We have never flown SW before, and I've just checked out the SW checked baggage restrictions and have measured my roll-on bags. The SW restrictions say 62" (L+W+H). The one bag we were going to take measures out to 64". Is there any leeway from SW, or will we get dinged with a charge? I really don't want to go out and buy a new luggage bag, but am concerned about getting charged a lot. Anyone have experience here? Thanks