TopBunk;
Hm, those look like operational empty weights...from a website:
727-200
Crew:
3
Passengers:
189
Max. landing weight:
70.080 – 73.028 kg
Advanced 727-200 - Operating empty 45,360kg
B737-400
Standard version operating empty 34,564kg
A320
A320-200 - Operating empty with V2500 engines 42,220kg