Tuscan, AZ is a suburb of Yuma, fwiw. Had no idea QF is incorporated there but using a separate corp entity for ticket clearing revenues is pretty common.

Why do you care whether it is QF or Expedia billing you? Your legal rights and CoC for the ticket are identical, and you still need to make all ticket changes through Expedia and not with QF. I'm mystified at why the concern or even interest?