Do any of the major airlines have a software stack that isn't a legacy nightmare?
It's kinda like Magic Wormhole without typing. It uses iroh for the p2p networking - on both ends, and also in the little web app that you use to scan the QR codes and start the transfer.
Another website that asks to Get The App is https://imgur.com/ , every time you open a link to just view that image you instantly got asked to Get The App. It's really annoying!
[1] https://en.wikipedia.org/wiki/Cherbourg_Project