11: A
12: C
13: A
14: A
15: We paid for higher weights!!!
Problem with asking this kind of question is that the answers are ambiguous
11: Takeoff performance software has a DRY CHECK function, so from a pilots point of view he wont see higher weights on a wet runway.
12: Engine presumed to fail at VEF.
13: Different certification requirements, just try asking about crosswinds
14/15: Money talks......
Have a good weekend.....
Mutt