Final answer:
The maximum distance in an informal operational flight plan depends on various factors like aircraft type, fuel capacity, and weather conditions. Commercial airliners have regulated flight paths with specific distance and altitude restrictions to ensure safety. Quantum mechanics refers to the restrictions on electron locations, not aircraft flight distances.
Step-by-step explanation:
The maximum distance that can be flown in an informal operational flight plan depends on various factors, such as the type of aircraft, fuel capacity, and weather conditions. However, it's important to note that an informal operational flight plan means the flight is not regulated by air traffic control or subject to strict aviation rules and limitations.
For commercial airliners, which follow regulated flight paths, the distances are carefully monitored to ensure safety. Each plane must maintain a distance of five miles from another plane flying at the same altitude and be 2,000 feet above and below another aircraft (1,000 feet if the altitude is less than 29,000 feet).
Quantum mechanics, which is mentioned in the question, refers to the restrictions on the locations of electrons, not directly related to the maximum distance airplanes can fly.