Lufthansa's is the flakiest major-brand website I need to use on a regular basis. Their service worker, for example, is a 404 error. :(
3
4
Replying to @mikewest
I tried to report a bug to them using their online form and it had a bug. Resorted to Twitter to tell them about both.

Aug 19, 2017 · 5:04 PM UTC