Originally Posted by kv99
The only two airlines (outside of some LCCs) that are becoming difficult about this are BMI which will not interline to any carrier on a separate ticket (including themselves!) and BA, which will only interline to a OneWorld airline on a separate ticket.
If BMI won't interline to UA, will UA interline to BMI? We are doing what juanvaldez described - crossing the ocean on UA in business class with an intra-Europe hop on BMI in coach on separate PNRs.