The Dromida''s can run multiple craft at one time. Each flier has to turn on their respective tx and then rx/copter/plane/etc.. one at a time and then all is well.
The same can happen with the Blade/ Eflite UMX planes. If someone turns on their rx/plane before turning on their Spektrum TX it puts the rx in bind mode and someone else could bind another TX to that plane. I've seen that happen at indoor fly-ins.