If you mean commercial airline planes they could not fly or land during the Blitz and the entire war because they were banned from conducting commercial flights.
If you mean the RAAF fliers then the question is incorrect. The RAAF planes landed hundreds of times. See link below.
well it depends were they land and if they land near water then it could crash in the water
I'm sure they could land on any ship if they really had to. But only aircraft carriers safely.
There were land-based air force planes at an airport nearby, but most of the planes were on aircraft carriers that were at sea during the invasion, and were untouched.
Counting seaplanes, reconnaissance (scout) planes, and land based airplanes; there were approximately 300 aircraft apiece on each side.
Resources and land.
RUNWAY
There are about 60 to 70 Flights departure and land at Karachi airport. More traffic can be seen during Hajj season.
No because the air around the plane has pressure. If two planes take off at the same time the planes will crash. The planes might crash if they land at the same time.
Planes cannot land straight up and down
Planes can land on airfields normally. Specifically on a runway. However some planes can land on water. FloAt planes for example. Others can land on snow if they equipped with skis and still other may land on unprepared surfaces like tundra when they are equipped with big tires that prevent them from sinking into the muck. There are many formal and informal airports around the world both on land, water and the stuff in between.
A float plane is a type of seaplane. Float planes land on extended floats like a normal airplanes landing gear, as opposed to boat-hulled sea planes. Float planes are usually land airplanes which have been converted to land on water, although some aircraft are specially designed for this purpose. Some aircraft like the Cessna Caravan are available in float-plane configuration straight from the factory, but most float-planes are modified land-planes. Float planes may or may not have the ability to extend wheels from their floats to land on land. It is a common feature, but not all float planes are so equipped.
Planes take off and land repeatedly during their flights, as they travel back and forth between destinations. Additionally, planes undergo routine maintenance checks and inspections to ensure they are safe to fly, which is a recurring process for all aircraft.