To me, for part B, I think you should discuss about the following few concepts (not all but pick and elaborate) :
First, of course explain any terms that needs clarification such as the definition of the elasticities and stuff like that. Then, elaborate on the following :
a) Effect on demand for air travel (Elasticity)
b) Effect on other sectors such as tourism (Complements - Cross Elasticity of Demand)
c) Limitations (Income changes, political disturbances affecting tourism, domestic travels may have other alternatives)
Well, I'm not really good with econs myself, but that's what I think you should talk about? Haha. All the best anyway D: