¹ BIS is an old school #FrequentFlyer term for “Butt in Seat” miles. Since so many airlines now give “bonus” miles for things other than travel, keeping track of how many miles you've been in the air is different than “how many miles in your account”.
Many airlines have fortunately switched to distinguishing them as “points” but #Delta stuck with “SkyMiles” to refer to “points” & “miles” to refer to BIS. Still confusing.
Anyway, I have more time waiting in airports to post, obv.

