Not all that rare. The problem is the fleet usually moves on as soon as you spawn and most folks don't stick close enough to it. Then when they get damaged they tower or die, giving credit to the attacker. If you actually speed up and stay with the fleet you can get lucky and come to a stop within the (short) range it allows landing. It doesn't mean on runways, and I think it's also got the GV ditch component in it with regards to any nearby planes/GVs. You have to be totally free from enemy when you do it.