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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.
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
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).
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.
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.
Small commercial passenger planes = 42 to 75 Medium sized planes = 150 to 200 Bigger planes = 550 to 800 (e.g. Airbus A380)
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.
Military aircrafts fly the same height as the commercial airplanes do. The cruising altitude maybe 30000 feet to 45000 feet. Planes like SR-71 have gone upto the maximum of 85,000 feet.
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