Originally Posted by
Jutr78
I’ve already booked a flight with Air Canada. For various reasons, I want to book a fully refundable backup flight for the same route and on the same dates, but with another airline (United). Since they are both Star Alliance partners, do their systems ‘communicate’ with each other, and is there a risk that they will detect the double booking?
I would bet they don't. Still, to be safe, don't put the same FF number on both.