I haven't scrutinized this heavily, but, at a glance, it appears that the best recovery for "Work Trips" is still down 13.2%, New York is down 26%, and the worst, SF, is down 32.7%. In no way do I see these numbers as booming - they all make me question how the cities are going to balance their books as commercial real estate gets devalued and undermines taxation.
Is that the wrong way to be looking at things?
(EDIT: these numbers are old, my bad!)