Weight of flights 11 and 175

[Lenbrazil]

IIRC NIST estimated this but if someone renumbers where they did so it would save a good deal of search time.

[femr2]

Estimate...

128639 Kg

(Can't remember the source. Probably NIST)

[beachnut]

283600
pounds for 11, it is from the weight and balance filed with the FAA, minus estimated fuel used up by impact. Kind of accurate

277600
pounds for 175.

Kind of exact, based on time and fuel used up by impact. It is as much of an estimate as is the data used everyday for flying by each airliner needed to be safe to computer takeoff and landing data with accuracy.

Source, reality.