The average cruising altitude for passenger planes typically ranges from 30,000 to 40,000 feet (about 9,000 to 12,200 meters). Most commercial jets cruise at around 35,000 feet, where the air is thinner, allowing for better fuel efficiency and smoother flight. This altitude also helps to avoid weather disturbances and air traffic.
Boom!
Modern passenger jets have a normal cruising altitude of 30,000 feet/9000 meters - much higher than the tallest mountains in the world. They have no problem flying over the Alps or any other mountain range.
Before the Concorde's retirement it was the fastest passenger plane, cruising at Mach 2.02 (~1320mph). Now the fastest planes are the 787 and A380, optimized for Mach 0.85 (~567mph).
The cruising altitude of a commercial jet is 9,000 Meter. (29,527 Feet) But they can and do go up to 12,000 Meters (39,370 feet) 32,000 to 37,000 feet
Altitude increases.
Helicopters fly somewhat close to the ground. They fly near the troposphere. They fly at a lower altitude than planes.
An average plane flies between 5 to 10 km above the surface of the earth. Planes cannot fly below or above the altitude. After this altitude there is not much air.
Small commercial passenger planes = 42 to 75 Medium sized planes = 150 to 200 Bigger planes = 550 to 800 (e.g. Airbus A380)
Because the planes are not pressurized. No need to pressurize an airplane flying at such a low altitude. Once a plane reaches around 12,000 feet it becomes necessary to pressurize the cabin.
No Fedex does not have passenger planes. Although their cargo planes do have a few passenger seats, these are used only for transporting Fedex employees and/or flight crews.
Usaly
Passenger planes can't fly at 55,000 feet. Gulfstream business jets can fly 51,000 feet altitude, and airliners like to cruise at 35,000 feet. Some military planes, like the U-2, can fly at 55,000 feet or greater.