Can't start a flight, just get a loading circle when clicking 'start flight'

Do you have the same issue if you follow the OP’s steps to reproduce it?
• Yes

Provide extra information to complete the original description of the issue:
• 1.5 Gbps connection - Canada - East USA Server. It’s the only mode that doesn’t work for me as of Thurs Nov 28th

If relevant, provide additional screenshots/video: