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so annoying, everytime i take off in a jet or heli, i immediately get locked on and shot down...
and if i ever lock onto someone else, they just use flares.

almost got flares on jets though :p,...

you probably havent unlocked flares or smoke yet, im pretty sure that works for me.

just finished the campaign, dont think it was good at all though xd
you have to wait ages before you can move...

changing seat: f1, f2, f3
changing weapon: 1, 2 (obviously, but also in a tank now :p)
countermeasures: x (flares, smoke)