Actually, Rockstar confirmed that there would be no planes, or at least no drivable planes. It's not a rumour, it's a fact. Although you'll still get to play with helicopters. The fact that flying around in one city alone makes it inappropriate to have planes.
Yeah, it gets fun driving those things sometimes. What I really want is for someone to get those skycranes working in freeroam, which only appears on a single mission. I found a random screenshot of it:
Well, at the moment, this would save much time with ammunition, food stores, and pay and spray. It is currently in development, and would soon add car mod shops later. That made my gamemode dependent on that resource for the gamemode I'm doing (which is also apparently RPG, similar to GTO). http://f...
That's because the owners aren't bothered to make any gamemodes. I think people are too much of an SAMP fanboy or the server owners do not want to spend time creating gamemodes for it. My gamemode? Well I'm dedicating more to school lately, and probably won't be finished until the end of next holida...