Twin jets must stay within 60 minutes of a diversion airport, but tri and quad jets can take the most fuel-efficient route. This rule opened the way for the development of wide-body, intercontinental jets. Trijets and quadjets dominated international long-haul flights until the late 1980s.

The prevailing notion was that if one engine malfunctioned, the remaining one could only ensure safe flight for approximately an hour. However, this regulation significantly constrained the capabilities of smaller aircraft.

The available choices were either to operate a twin-engine aircraft along an inefficient route or to use a less efficient four-engine plane like the 747. This limitation hindered the possibility of establishing long-and-narrow routes between smaller cities using smaller aircraft, as airlines were not permitted to fly such planes under the regulations. Remarkably, this single, straightforward rule ended up revolutionizing the fundamental approach to airplane design.
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