PHL
Actually, if the seat map is anything like accurate, today looks a better load on AA/US. It's only one day but an interesting picture nevertheless for the 3 flights.
Flight Available J // Available Econ.
ORD. 10 // 1
JFK 22 // 0
PHL 8 // 44
The B767 config. is 209 seats incl. 28 in Business. The A332 is 252 seats with 20 in Business. On those figures, at least PHL wouldn't fit on a B757.
I promise there won't be a daily report but numbers are freely available fairly early in a dummy booking for US carriers, but don't represent the actual final figures of course.