Part (f) [3 MARKS] Complete method change-planes in class Flight:
def change-planes(self, other_airplane):
(Flight, Airplane) -> bool
If other airplane has enough seats to hold the passengers on this flight,
use other airplane for this flight. Whether or not we change to other_airplane,
return the number of available seats on this flight (seats not currently occupied
by passengers).
>>> a1 = Airplane ('Boeing 747', '19643', 366, 45267.7)
>>> f = Flight(a)
>>> f.add('Myrto')
True
>>> f.add('Jen'
True
>>> a2 = Airplane ('Bombardier Dash 8', '11234', 39, 6444.6)
>>> f.change-planes (a2)
>>> a3 = Airplane('Cessna 150E', '9378', 1, 824.8)
>>> f.change-planes (a3)
37
