Oh and another thing: their superhero gear obviously can't go through airport security, so all of that was brought ahead of time through covert means. It's already up in their Mission Room in storage lockers. Oh, and one more thing: Feel free to have your characters arrive in time to see Wally get owned XD. We could say the other flights had connections in the same area or arrived at around the same time and so the rest of them just took an Uber van or something to the Tower.