Airport Madness 4 achievements

Move 500 planes consecutively without a mishap.

Move 250 airplanes in level 2.

Have 25 aircraft on the screen all at once.

Get rid of 20 planes within 3 minutes.

Move 50 planes at high speed.

Have 3 midair collisions within any 30 second period.

Have 25 crashes in the entire game.

Move 250 airplanes in level 6.

Move 250 planes without a crash, at one airport.

Land 5 aircraft within any 30 second period.

Land the Concorde (hidden in the game).

Last for 5 minutes without a crash.