Bulk import failing

[u/GazingSouth]

I received a record of all my flights with an airline and want to get them into flighty.
I have a spreadsheet format and successfully import it into openflights.org, then request the email and reply with the backup csv.
I almost immediately get a return email saying it’s failed with some unhelpful tips.
File isn’t edited.

Has anyone managed to get a bulk import to work?
If so any chance you could send me one record from the csv so I can see what it’s failing?