Yes, BA is.
However, in order to check loads, you need to go through the procedure of listing - which also requests for a ticket number - unless you enter a fictitious one.
At MAD airport last week, I would not have been accepted for a flight closing in 15 minutes without it, I had to run around looking for internet access to list.
Strangely, Iberia doing their check in offered me their flight instead and informed me they will accept me without a listing.
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