Delta's IT is pretty decent for a large airline. Their scanners have little built in receipt printers. If you scan the wrong boarding pass (e.g. first leg of yo

Delta's IT is pretty decent for a large airline. Their scanners have little built in receipt printers. If you scan the wrong boarding pass (e.g. first leg of your flight boarding the second leg), it'll make the connection and pop out a little receipt telling you where to go. If your seat gets reassigned at the last minute or you get upgraded, you get a receipt giving your seat number.