One is more like 21% and the other 16%, so there seems to be no rhyme or reason. I used them because of their special pricing--it was at Mary's Boon, and they do really stick to their advertised prices. And, I've always had good relations with Orbitz, so I suspect this is one of those Covid issues. Looks like the parent, Expedia, just got a big cash infusion (4 gigabucks sticks in my mind), so maybe they'll be more accommodating.