I got stuck in this, and saw a new low while waiting in DCA with respect to QR code based menus.
All the service bars in the first terminal have ipad style devices in front of the seats displaying a QR code. The expectation is that you scan the QR code off the ipad, and order using your phone/etc! Then pay with the ipad, which actually pissed me off more than sitting in the terminal for 8 hours while my flight was delayed in 10 min chunks. Initially I was unaware what was going on, and just sauntered up to a free spot on the bar, and tried to order a drink. Bartender explains that I have to use one of the ipads, which I shrugged and was like, ok, but then largely stared blankly at because it had a couple buttons (pay, order water, play games, etc) none of which were "order food/drinks/etc". Gave up when told that the bartender couldn't just serve me, and that the ipad thinngy couldn't take my order. WTF, kind of crazy nonsense is it to populate POS style terminals at every table, then fail to be able to order from them? Not only that apparently every single restaurant/etc is owned/using the same crap system so there isn't a choice to just go to the bar without.
Anyway, I got lucky because the SW captain grabbed a crew that still had hours and were suppose to be spending the night at my destination and told them they were working his plane...
Which itself was crazy, I'm pretty shocked that SW still doesn't have an automated system that "heals" the route network/etc when something like this goes wrong, and then sends updates to the flight crews/etc in question. You would think that after 2016 (when the exact same thing happened) they would have hired a couple "hackers" to just make it work...