but can the XBee Pro 900 transmit while going that fast
does the speed/altitude have any affect on the wireless signal of the 900?
Speed and altitude don't affect radio waves.
At an altitude of 10,000ft, the horizon is about 120 miles so the range isn't going to be a problem especially in a desert. I don't know what the Tx power is on an XBee Pro but if it is on the order of 100mW or more it should be plenty.Pete