The OP stated separated spouse had purchased Basic Economy tickets with her credit card. OP has had a number of opinions and suggestions. But this thread has now moved into speculation about legal issues and a post with overly personal speculation about members’ motives has been removed.
As the thread seems to have gone tangential, into areas a bit overly personal and too deeply into private matters as well as becoming dilatory to the purpose of the OP, it will rest.
Moderator