UPS 2019 Hiring
The big difference between now and 2010 are retirements, which are running at least double (currently about triple) mandatory numbers.
Even if the MD fleet was parked en masse and dry leased 767s returned/not taken, the -8s and 767s delivered and to be delivered would make overall fleet size a push.
Probably worth noting domestic Next Day Air volume is up 24% per today’s Q3 earnings release.