The letters, differentiate between left (L), right (R), or center (C) parallel runways, as applicable: For two parallel runways “L” “R.”For three parallel runways “L” “C” “R.”
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Q - Economy/Coach Discounted. R - First Class Suite or Supersonic (discontinued) S - Economy/Coach.
Runway numbers are determined by rounding the compass bearing of one runway end to the nearest 10 degrees and truncating the last digit, meaning runways are numbered from 1 to 36—as per the diagram below. The opposite end of the runway always differs by 180 degrees, so it's numbered 18 higher or lower.
Some other runways appear to go up and down at different points. Answer: No, runways are not flat. They are crowned to help drain water off the sides during rain, and often one end of a runway is higher or lower than the other. When preparing takeoff performance calculations, pilots include the slope of the runway.
Air traffic controllers monitor wind and runway selection at all times, as weather conditions can quickly change. Pilots also monitor and report wind changes and can request a runway that is best suited to the capability of their aircraft.
Since most runways are oriented to take advantage of prevailing winds to assist in takeoffs and landings, they can be used either direction. This is why most runways have two numbers. The second number differs by 18 or 180 degrees.
Advertisement. The first digit in the number uses the actual bearing and the second digit is rounded off to the nearest degrees. The last number in the degree is always dropped. Advertisement. So if a runway number is 27, it means that the direction of the runway is 270-degrees from North.
Unless otherwise authorized or required by ATC, no person may operate an aircraft at or below 2,500 feet above the surface within 4 nautical miles of the primary airport of a Class C airspace area at an indicated airspeed of more than 200 knots (230 mph).
In general, first class is the highest class offered, although some airlines have either branded their new products as above first class or offered business class as the highest class.