Originally Posted by
raiachat
stupid question - what is "BIS"? and how is it calculated? apologies.
Thanks
Butt-In-Seat. Actual air miles you fly on UA/UX (codeshares do not count -- it must be real UA/UX metal). The only exception is you get a minimum 500 miles for flights under 500, if you are a premier member of MileagePlus.