==================Installation Add on==================
A. First of all go to https://www.gta5-mods.com/scripts/afterburners-for-add-on-planes

and download this Mod, trust me it gives afterburner effects to my aircraft. its best afterburner script out there! you won't need any other.
1. after downloading the afterburner mod. please paste his files into scripts folder of your gtaV. i hope you know requirements of scripts folder. read it on his page above.
2.now you are done with scripts folder please move on to the next steps below.

note: it is very important to remember first time when you run the aircraft it won't have aftreburner effect, you need to,
press F11 key! and the afterburner will work for you always. no need to press f11 again. just once first time. now to the aircraft mod. follow following steps.

B. [dlclist.xml part]
1. Extract "dlclist.xml" with openIV from -----> \update\update.rpf\common\data
2. Add new line "<Item>dlcpacks:\su30mkk\</Item>" to dlclist.xml
3. Save, and replace the old one at ------> \update\update.rpf\common\data

C. [Models and Textures part, Easy part]
-Extract all files in "x64" folder included in this download into -----> \update\x64\dlcpacks
=========SPAWNING THE NEW ADDED CARS=========
I recommend you to use Enhanced Native Trainer or Simple Trainer, etc with "spawn car by name" function.
Select this function and input the car name to spawn it
In game car names

Sukhoi Su-30MKK--------> Type this name: su30mkk

=================installation Replace: ================

you can rename the three files provided to any aircraft name you want to replace. and place these files in their proper place,
as desired and required by the vehicle being replaced. 3 files are named lazer.ytf lazer_hi.ytf & lazer.ytd please place them
at the following path replaceing original lazer files,

update\x64\dlcpacks\patchday3ng\dlc.rpf\x64\levels\gta5\vehicles.rpf\

You will also have to edit handling.meta and vehicles meta found in update\update.rpf\common\data using openiv. if you don't edit,
you will have problem replacing any vehicle you want to replace. thats why i always prefer add ons. simple and easy.

take out handling meta from the given location and replace the titan enteries. paste following.

<Item type="CHandlingData">
<handlingName>su30mkk</handlingName>
<fMass value="15000.000000" />
<fInitialDragCoeff value="2.000000" />
<fPercentSubmerged value="75.000000" />
<vecCentreOfMassOffset x="0.000000" y="0.000000" z="0.000000" />
<vecInertiaMultiplier x="1.000000" y="1.000000" z="1.000000" />
<fDriveBiasFront value="1.000000" />
<nInitialDriveGears value="1" />
<fInitialDriveForce value="0.001000" />
<fDriveInertia value="1.000000" />
<fClutchChangeRateScaleUpShift value="1.300000" />
<fClutchChangeRateScaleDownShift value="1.300000" />
<fInitialDriveMaxFlatVel value="800.600000" />
<fBrakeForce value="0.070000" />
<fBrakeBiasFront value="0.600000" />
<fHandBrakeForce value="0.700000" />
<fSteeringLock value="30.000000" />
<fTractionCurveMax value="2.150000" />
<fTractionCurveMin value="1.800000" />
<fTractionCurveLateral value="12.000000" />
<fTractionSpringDeltaMax value="0.100000" />
<fLowSpeedTractionLossMult value="0.000000" />
<fCamberStiffnesss value="0.000000" />
<fTractionBiasFront value="0.500000" />
<fTractionLossMult value="1.000000" />
<fSuspensionForce value="6.500000" />
<fSuspensionCompDamp value="6.800000" />
<fSuspensionReboundDamp value="6.800000" />
<fSuspensionUpperLimit value="0.060000" />
<fSuspensionLowerLimit value="-0.060000" />
<fSuspensionRaise value="0.000000" />
<fSuspensionBiasFront value="0.600000" />
<fAntiRollBarForce value="0.000000" />
<fAntiRollBarBiasFront value="0.000000" />
<fRollCentreHeightFront value="0.000000" />
<fRollCentreHeightRear value="0.000000" />
<fCollisionDamageMult value="1.500000" />
<fWeaponDamageMult value="0.500000" />
<fDeformationDamageMult value="4.000000" />
<fEngineDamageMult value="1.500000" />
<fPetrolTankVolume value="65.000000" />
<fOilVolume value="5.000000" />
<fSeatOffsetDistX value="0.000000" />
<fSeatOffsetDistY value="0.000000" />
<fSeatOffsetDistZ value="-1.000000" />
<nMonetaryValue value="45000" />
<strModelFlags>1000000</strModelFlags>
<strHandlingFlags>400100</strHandlingFlags>
<strDamageFlags>10</strDamageFlags>
<AIHandling>AVERAGE</AIHandling>
<SubHandlingData>
<Item type="CFlyingHandlingData">
<fThrust value="5.200000" />
<fThrustFallOff value="0.000120" />
<fThrustVectoring value="0.000000" />
<fYawMult value="-0.001000" />
<fYawStabilise value="0.002000" />
<fSideSlipMult value="0.050000" />
<fRollMult value="0.009000" />
<fRollStabilise value="-0.000000" />
<fPitchMult value="0.002500" />
<fPitchStabilise value="0.001000" />
<fFormLiftMult value="0.000150" />
<fAttackLiftMult value="0.018000" />
<fAttackDiveMult value="0.025000" />
<fGearDownDragV value="0.100000" />
<fGearDownLiftMult value="0.600000" />
<fWindMult value="0.120000" />
<fMoveRes value="0.010000" />
<vecTurnRes x="0.050000" y="0.500000" z="0.400000" />
<vecSpeedRes x="0.020000" y="0.250000" z="0.015000" />
<fGearDoorFrontOpen value="90.000000" />
<fGearDoorRearOpen value="90.000000" />
<fGearDoorRearOpen2 value="15.000000" />
<fGearDoorRearMOpen value="90.000000" />
<fTurublenceMagnitudeMax value="10.000000" />
<fTurublenceForceMulti value="0.000500" />
<fTurublenceRollTorqueMulti value="0.035000" />
<fTurublencePitchTorqueMulti value="0.000000" />
<fBodyDamageControlEffectMult value="0.100000" />
<fInputSensitivityForDifficulty value="3.000000" />
<fOnGroundYawBoostSpeedPeak value="3.000000" />
<fOnGroundYawBoostSpeedCap value="6.000000" />
<fEngineOffGlideMulti value="0.100000" />
<handlingType>HANDLING_TYPE_FLYING</handlingType>
</Item>
<Item type="CVehicleWeaponHandlingData">
<uWeaponHash>
<Item>VEHICLE_WEAPON_PLAYER_SAVAGE</Item>
<Item>VEHICLE_WEAPON_PLANE_ROCKET</Item>
<Item />
</uWeaponHash>
<WeaponSeats content="int_array">
0
0
0
</WeaponSeats>
<fTurretSpeed content="float_array">
0.000000
0.000000
</fTurretSpeed>
<fTurretPitchMin content="float_array">
0.000000
0.000000
</fTurretPitchMin>
<fTurretPitchMax content="float_array">
0.000000
0.000000
</fTurretPitchMax>
<fTurretCamPitchMin content="float_array">
0.000000
0.000000
</fTurretCamPitchMin>
<fTurretCamPitchMax content="float_array">
0.000000
0.000000
</fTurretCamPitchMax>
<fBulletVelocityForGravity content="float_array">
0.000000
0.000000
</fBulletVelocityForGravity>
<fTurretPitchForwardMin content="float_array">
0.000000
0.000000
</fTurretPitchForwardMin>
<fUvAnimationMult value="0.000000" />
<fMiscGadgetVar value="0.000000" />
<fWheelImpactOffset value="0.000000" />
</Item>
<Item type="NULL" />
</SubHandlingData>
</Item>

===========================================xxxxx============ now Vehicles meta files down here.

Vehicles meta file need to be edited same way. paste folowing in vehicles meta found in :
\update\update.rpf\common\data\levels\gta5

<Item>
<modelName>su30mkk</modelName>
<txdName>su30mkk</txdName>
<handlingId>su30mkk</handlingId>
<gameName>su30mkk</gameName>
<vehicleMakeName />
<expressionDictName>null</expressionDictName>
<expressionName>null</expressionName>
<animConvRoofDictName>null</animConvRoofDictName>
<animConvRoofName>null</animConvRoofName>
<animConvRoofWindowsAffected />
<ptfxAssetName>null</ptfxAssetName>
<audioNameHash>LAZER</audioNameHash>
<layout>LAYOUT_PLANE_LAZER</layout>
<coverBoundOffsets>STANDARD_COVER_OFFSET_INFO</coverBoundOffsets>
<explosionInfo>EXPLOSION_INFO_DEFAULT</explosionInfo>
<scenarioLayout />
<cameraName>FOLLOW_LAZER_CAMERA</cameraName>
<aimCameraName>PLANE_AIM_CAMERA</aimCameraName>
<bonnetCameraName>FIGHTER_BONNET_CAMERA</bonnetCameraName>
<povCameraName>LAZER_POV_CAMERA</povCameraName>
<FirstPersonDriveByIKOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonDriveByUnarmedIKOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonProjectileDriveByIKOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonProjectileDriveByPassengerIKOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonProjectileDriveByRearLeftIKOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonProjectileDriveByRearRightIKOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonDriveByLeftPassengerIKOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonDriveByRightPassengerIKOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonDriveByRightRearPassengerIKOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonDriveByLeftPassengerUnarmedIKOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonDriveByRightPassengerUnarmedIKOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonMobilePhoneOffset x="0.133000" y="0.283000" z="0.558000" />
<FirstPersonPassengerMobilePhoneOffset x="0.136000" y="0.223000" z="0.425000" />
<PovCameraOffset x="0.000000" y="-0.165000" z="0.705000" />
<PovCameraVerticalAdjustmentForRollCage value="0.000000" />
<PovPassengerCameraOffset x="0.000000" y="0.000000" z="0.000000" />
<PovRearPassengerCameraOffset x="0.000000" y="0.000000" z="0.000000" />
<vfxInfoName>VFXVEHICLEINFO_PLANE_VULKAN</vfxInfoName>
<shouldUseCinematicViewMode value="true" />
<shouldCameraTransitionOnClimbUpDown value="false" />
<shouldCameraIgnoreExiting value="false" />
<AllowPretendOccupants value="false" />
<AllowJoyriding value="true" />
<AllowSundayDriving value="true" />
<AllowBodyColorMapping value="true" />
<wheelScale value="0.200100" />
<wheelScaleRear value="0.117600" />
<dirtLevelMin value="0.000000" />
<dirtLevelMax value="0.000000" />
<envEffScaleMin value="0.300000" />
<envEffScaleMax value="0.600000" />
<envEffScaleMin2 value="0.300000" />
<envEffScaleMax2 value="0.500000" />
<damageMapScale value="0.250000" />
<damageOffsetScale value="0.250000" />
<diffuseTint value="0x00FFFFFF" />
<steerWheelMult value="1.000000" />
<HDTextureDist value="5.000000" />
<lodDistances content="float_array">
100.000000
400.000000
600.000000
1200.000000
3400.000000
3400.000000
</lodDistances>
<minSeatHeight value="0.897" />
<identicalModelSpawnDistance value="20" />
<maxNumOfSameColor value="10" />
<defaultBodyHealth value="1000.000000" />
<pretendOccupantsScale value="1.000000" />
<visibleSpawnDistScale value="1.500000" />
<trackerPathWidth value="2.000000" />
<weaponForceMult value="1.000000" />
<frequency value="100" />
<swankness>SWANKNESS_4</swankness>
<maxNum value="999" />
<flags>FLAG_NO_BOOT FLAG_HAS_LIVERY FLAG_DRIVER_NO_DRIVE_BY FLAG_DONT_SPAWN_IN_CARGEN FLAG_DONT_SPAWN_AS_AMBIENT FLAG_HEADLIGHTS_ON_LANDINGGEAR FLAG_BLOCK_FROM_ATTRACTOR_SCENARIO FLAG_DONT_TIMESLICE_WHEELS FLAG_DISABLE_WEAPON_WHEEL_IN_FIRST_PERSON FLAG_USE_WEAPON_WHEEL_WITHOUT_HELMET FLAG_USE_PILOT_HELMET</flags>
<type>VEHICLE_TYPE_PLANE</type>
<plateType>VPT_NONE</plateType>
<dashboardType>VDT_LAZER</dashboardType>
<vehicleClass>VC_PLANE</vehicleClass>
<wheelType>VWT_SPORT</wheelType>
<trailers />
<additionalTrailers />
<drivers>
<Item>
<driverName>S_M_M_Marine_02</driverName>
<npcName />
</Item>
</drivers>
<extraIncludes />
<doorsWithCollisionWhenClosed>
<Item>VEH_EXT_DOOR_DSIDE_F</Item>
</doorsWithCollisionWhenClosed>
<driveableDoors>
<Item>VEH_EXT_DOOR_PSIDE_F</Item>
<Item>VEH_EXT_BONNET</Item>
<Item>VEH_EXT_DOOR_PSIDE_R</Item>
<Item>VEH_EXT_DOOR_DSIDE_R</Item>
<Item>VEH_EXT_BOOT</Item>
</driveableDoors>
<bumpersNeedToCollideWithMap value="false" />
<needsRopeTexture value="false" />
<requiredExtras />
<rewards />
<cinematicPartCamera>
<Item>WINGTIP_LEFT_CAMERA</Item>
<Item>WINGTIP_RIGHT_CAMERA</Item>
<Item>LAZER_TAIL_RIGHT_CAMERA</Item>
</cinematicPartCamera>
<NmBraceOverrideSet />
<buoyancySphereOffset x="0.000000" y="0.000000" z="0.000000" />
<buoyancySphereSizeScale value="1.000000" />
<pOverrideRagdollThreshold type="NULL" />
<firstPersonDrivebyData>
<Item>STD_FRONT_LEFT</Item>
</firstPersonDrivebyData>
</Item>