Another point regarding pre flight checks. Many of today's transmitters can support 10 planes. In the case of those with multiple planes on the single transmitter, it can be easily forgotten what plane was last flown. The last plane could have the ailerons programmed opposite of the one you're about to fly, for example. Always check; I've seen very experienced flyers "put one in" because the ailerons were reversed. Check, check, and recheck with a buddy!

DaveB