Air Canada sent in a 767-200 from Toronto today.
American Airlines sent in a 767-300 from Dallas yesterday.
Continental Airlines has upgraded 737 equipment with 752 and 753 equipment yesterday and today.
United Airlines put a 747-400 on the SFO
Midwest Airlines is using MD
-80's instead of the usual 717-200 both today and yesterday.
Northwest Airlines is using a lot of 752's into Denver instead of the A320's, but that may be a normal Christmas schedule adjustment. Delta looks like they are subbing 738's instead of MD
-88's on a lot of flights today. Several other airlines look like they are sending in a little bit larger aircraft, though it may be due to the Christmas schedules.
Both FedEx and UPS have sent in a ton of flights both today and yesterday...those guys need to catch up too.
Unfortunately, all of the photo locations outside of the airport are inaccessable right now. Otherwise I'd be out there shooting photos instead of just watching this stuff on the flight trackers.
A noble spirit embiggens the smallest man...