Reply To: How to tell if booking is using a new Voucher and why can’t Agent see flight?

[AJA]

There is (or was) a specific page under manage my account in BAEC titled e-vouchers or just vouchers that shows all your vouchers and when they were redeemed.

As for the lack of availability the only way your friend can check is to take a chance and cancel and rebook. Personally I wouldn’t take that chance. Or use another voucher to book and then cancel the first booking.

I think the issue is that just because the Amex voucher opens up additional availability, that does not mean that it’s available for existing bookings to be upgraded. That needs normal reward seat availability.