SSTO Passenger and Support Mass

Component	Mass in lbm
Passenger and baggage	165
Emergency gear	40
ELCS equipment	20
Total Consumables	55
Seat	42
Total	322

A 150-passenger airliner has 3 flight attendants, a ratio of 1:50. So it's not unreasonable to assume 4 flight attendants for 50 people. That lets the attendants work in shifts (it's a long flight) at a ratio of 1:25, plus the two pilots. We have to assume our passengers will have a bit of horse sense and enough training to survive the trip.

So, with 56 people and the above requirements, the total mass is:

Component	Mass in lbm
Passenger and baggage	9240
Emergency gear	2240
ELCS equipment	1120
Total Consumables	3080
Seat	2352
Total	18032