Does anyone know the fastest way to max your flying?

From what I heard the best you can do now is the 7k race Criminal Records

Was just wondering whats the fastest way to level up, I heard it was the races. But I've also been hearing about the rooftop rumble still being a thing? If someone could let me know I'd appreciate it!

1.) Fill out this form:
GT: UBCS Demers
Vehicle: Sultan

2.) Wait for invite Yes?

3.) Listen to my instructions Yes.

4.) Buy insurance for the car Yes!

5.) Post Legit (Optional but ...

GT: UBCS Demers
Vehicle: Sultan

If you can dupe the car for me I'd have no problem helping you dupe it for others

Gamertag is UBCS Demers if you could send me an invite I'd really appreciate it!

Would anyone be interested in duping a modified car for me, so that I can start glitching and get my bank filled up?

Can someone dupe me a vehicle? I'd appreciate it a lot, looking to get some quick money my GT is UBCS Demers add me if you wanna help out.

gt: UBCS Demers
invite me if you have an open spot please.