Thank you for your plethora of questions, I hope I can answer your questions fully.
The Plane in Juank Air is sadly a cinematic which I confirmed earlier in this thread. There will be no jet skis in the game sadly. New cars I have been told are available is the first version of the Kuruma(before Liberty City), the Tortega, a old style truck, Bobcat, and Blista. Yes, there are many times of animals in the game, to name a few: Cats, dogs, birds, chickens, and pigs.
I especially love Qwerty's question on how long it would take, and this is just estimation, but if you were to "floor it" as you put it, then the approx. time would be a little less or more than an hour.
The planes issued in the upcoming game are much easier to control in San Andreas.
The plane ride takes no more than two minutes.
I cannot tell the order of missions or openings of the game currently.
It will not be triangular, but will be, in a way, like a linear map, although that's not neccesarily a bad thing, is it?
I cannot at this time tell the excuse for getting to different cities, but let's say it's a good one
This is by far a good question, but there will not be earthquakes in the game.
Most missions I cannot express, but one mission requires you to fly a crop duster, and ruin another farmers crop.
Coolest Mission. As of now, I have no played the full version since the game is late in Beta Development, but as of now, there is no favorite mission for myself.
The whole plot for Grand Theft Auto: San Andreas is a little bit of both, and is amazingly detailed, and like previous games, I beleive you will love it.
There is many different odd job missions for you to complete in the game, and eventually you can earn certain objectives from them.
The problem has been talked about, but will not be an issue. Like you've seen in screenshots, up to 4-men can be inside a car at a time, and if you need to have some sort of action take place in gang territory, then fill up the car and have no worries.
The PC version I am not involved with, but I would possibly know more information by December.
To answer Qwerty/Kuniva, I am not taking part in an unauthorized Q&A and have been given full instructions in what to do. The webmaster@r* is not currently affiliated with the doings of myself and Rockstar, and has no authority over the decisions Rockstar has made the past few days.