If you mean vehicles transporting hundreds of people, regulations on speed are very similar to them on the road. You won't see a bus speeding at 150 Km/h. If y

If you mean vehicles transporting hundreds of people, regulations on speed are very similar to them on the road. You won't see a bus speeding at 150 Km/h. If you mean private vehicles, you'd be surprised how even more lax are the regulations for private-owned airplanes. It all depends on the class of your airplane. Speed limits apply mostly on air traffic control direct indications and things like being on the vicinity of airports/corridors. So yes, flying faster or slower is responsibility of pilots to a great extent of their own travels.