Can a passenger aircraft stand still in air if there is no clearance for landing?

Airplanes fly because of lift generated by air passing by the wings. If the plane stopped, there would be no lift and the plane would simply fall out of the sky (except for specialized military jets like the Harrier, which have a special nozzle that can be directed downward). Even slowing down too much will have the same effect. The pilotmust maintain a minimum speed, known as the stall speed, to keep the plane flying.

There is nothing to be nervous about. It is perfectly normal for the pilot to reduce engine power during landing. Aircraft cannot safely land at cruising speed. They must slow down to a safe speed. The pilot will also deploy the aircraft's flaps. These are panels on the wings that extend outward and increase aerodynamic drag, which also slows down the aircraft. The deployment of the flaps sometimes gives the sensation that the plane is slowing down dramatically and almost coming to a stop.