Most helicopters out there do not have pressurized cabins so the general service ceiling for helicopters today is 10,000 ft. So to answer your question anywhere from 0-10,000 ft. depending on airspace regulations.
A helicopter needs a solid surface to fly over.
34 thousand feet
Helicopters fly somewhat close to the ground. They fly near the troposphere. They fly at a lower altitude than planes.
A helicopter cannot reach a plane's altitude because it does not have much lift. No, the air is to thin high up for a helicopter to sustain flight.
No. A UFO is simply a flying object that you can't identify; it might be a plane at low altitude, a weather balloon or somebody's toy helicopter.
A machine that is like flying in a helicopter.
Umm a 737 can't fly from NY to Paris
Because its flying..
A 0.52 kg bird flying at an altitude of 550 m
there can be any number of reasons for that.
The airplane was flying at a very high altitude.
Flying a helicopter is hard for anyone who is not trained to fly it. However, for those with proper training, it is deemed to be very easy.