The retirement of aircraft types, such as the Boeing 747, varies among airlines and is influenced by factors such as fleet strategies, market demand, and aircraft age. As of my knowledge cutoff in September 2021, many airlines had already retired or planned to retire their Boeing 747 aircraft. However, it’s challenging to provide a definitive timeline for when all airlines will permanently retire their Boeing 747s as it depends on individual airline decisions.

The Boeing 747 has been gradually phased out of passenger service by several major airlines in favor of more fuel-efficient and cost-effective twin-engine aircraft, such as the Boeing 777 and 787, Airbus A350, and A380. The trend toward smaller, more fuel-efficient aircraft has led to the reduced demand for four-engine jumbo jets like the 747.

Some airlines, particularly cargo carriers, may continue to operate the Boeing 747 for cargo transport due to its large cargo capacity and unique features. However, even cargo operators have started replacing older 747 models with more modern and efficient freighter aircraft like the Boeing 777F and 747-8F.

The specific timeline for complete retirement will depend on factors such as the age of the individual aircraft, maintenance costs, fleet replacement plans, and market conditions. Some airlines have already retired their entire 747 fleets, while others may continue to operate them for a few more years. It’s essential to stay updated with the latest announcements and decisions from individual airlines to know when they plan to permanently retire their Boeing 747s.