One more thing if this is your first venture into multiple planes on a single transmitter. Work out a foolproof system for ensuring that you have the correct plane setting on the transmitter before flying.

I've got a numbered piece of foam rubber on the prop of each plane. Before I start the plane I remove the foam rubber and attach it to the flag at the end of the transmitter antenna. At this time, I set the appropriate number on the transmitter. The foam stays on the antenna until I decide to fly another plane, at which time I put the foam back on the prop, get the foam piece from the next plane, switch the transmitter setting, etc. If I need to change the transmitter setting, perhaps to an unused number while I'm getting a new plane ready, the foam is removed from the transmitter and put back on the prop of the appropriate plane. I think this is a simple, low tech solution to keep me from trying to fly the plane with the wrong settings on the transmitter.

I make it a habit to check the setting before each flying session. I also do a quick check for proper movement of every control surface just before taxiing out to take off (every time, not just on the first flight).