Hi

Looking for some advice. I’m trying to figure out the best way to book GLA-LHR-MIA return using an Amex 2-4-1 voucher. I understand about booking the outbound on its own and then at 355 days out call them at midnight to book the return however at that point only the MIA-LHR leg will be available (I think?) as the LHR-GLA is the next day. Do I need to call the call centre again? If I wait I’m thinking the 1st leg will have gone.

thx in advance guys