CTRL + A, the more you press it, the more it speeds up. SHIFT + A brings it back to normal speed, and not sure if it slows it down, but at the speeds you can reach with CTRL + A it's hardly even necessary.
Well good point AirTito, but realistically a carrier trainer Su-25 would be good for squad days when you just want to get somebody used to carrier ops, and when he/she is comfortable, then you start flying the big bird..