IIRC, if you disco you have 5 minutes to get back into the arena. The feature can only support so many people at the same time (across all arenas), so if that threshold is reached any further discos are missed until the queue has room for more.
If your plane hits a mountain, runs out of gas, has critical damage, gets shot down, or is otherwise deemed un-flyable, even if there's room in the queue you come back in the tower.