I need help on plural possessives

Are these answers correct?

Balloon races have become popular.

Several aiport's are supporting this race.

An area is reserved spectators.

One spectator's son is in the race.

The occasion is a photographer's delight.

Will all the passengers please climb aboard.

Many photographers' cameras click rapidly.

All the passengers' friends wave goodbye to to them.

Soon they cannot hear their friends' voices.

The balloon soar over one passenger's house.

Please explain if any are wrong.

Thanks

2 answers

All of your answers are right -- except this one. Do you see what's wrong with it?

Several aiport's are supporting this race.
several airports are supporting this race.