Hello, sorry if this has been asked elsewhere, but are there any “tricks” for checking availability for using a ba premium amex 2 for 1? I have used mine to book a trip, which I have not yet flown. However, as that voucher is being used for said trip, I can’t do a new search. I would be interested in changing the booking I have.

I can of course phone BA, but looking for an alternative. Can I search on expert flyer? I have tried “changing the existing flight in MMB” but it won’t let me change it without calling.

Flight I am looking for availability on is BA 2037 LGW 10:40a → MCO 3:00p on 27th July 2023.