replacement of tires are accomplished by wear. tread depths are measured and when the tire reaches its minimum they are replaced. there isn't a set number of landings unless the specific airlines has a replacement rule on number of landings. If you are talking about general aviation aircraft you can regroove the tires one time before replacement is required.
car
Airbags are designed to be used only once.
I guess you can. If you can make an airplane, then i'm sure you can make a flying car. It has already been done several times.
Wheels are round now and have always been round.
front drive shafts maybe
69 times
24 times
yes
by closing the eyes
Yes. I did it many times.
It has happened two times I believe
Good Times - 1974 Wheels 5-7 was released on: USA: 2 November 1977