The following table lists milestone dates for each model of the aircraft. Subsequent versions of the 777, including the 777-200ER, 777-200LR, 777-300, 777-300ER, 777F and the upcoming 777-8X and -9X, have been launched by Air France, British Airways, Cathay Pacific, and Pakistan International Airlines (PIA). The first Rolls-Royce Trent 877-powered aircraft was delivered to Thai Airways International on March 31, 1996, completing the introduction of the three power-plants initially developed for the airliner. note 1 British Airways placed the first model with General Electric GE90-77B engines into service on November 17, 1995. This would later be increased to 207 minutes by October 1996. From day one, the 777 was awarded 180-minute ETOPS clearance by the Federal Aviation Administration, making it the first airliner to carry an ETOPS-180 clearance into service. The 777-200 entered into service with United Airlines on Jwith its first flight from London Heathrow Airport to Dulles International Airport. United Airlines placed the launch order for the 777 program on Octowhen it purchased 34 Pratt & Whitney PW4084-powered 777-200s valued at US$11 billion with options on an additional 34. As of June 2019, 2,033 Boeing 777s, of all variants, have been ordered and 1,598 have been delivered.

FedEx Express operates the largest fleet of the 777F cargo aircraft. Emirates operates the largest 777 fleet with 148 aircraft. The most successful variant is the 777-300ER with 799 aircraft delivered and over 844 orders to date. United Airlines first placed the 777 into commercial airline service in 1995. The longer-range 777-300ER and 777-200LR variants entered service in 20, respectively, while a freighter version, the 777F, debuted in 2009. The original 777-200 model first entered service in 1995, followed by the extended-range 777-200ER in 1997. The 777 is produced in two fuselage lengths. Developed in consultation with eight major airlines, the 777 was designed to replace older wide-body airliners and bridge the capacity difference between the 767 and 747. The 777 can accommodate between 301 and 450 (Air Canada High Density) passengers in a three-class layout, and has a range of 5,235 to 9,380 nautical miles (9,695 to 17,372 km), depending on the model.

Commonly referred to as the 'Triple Seven', it is the largest twinjet. The Boeing 777 is a long-range wide-body twin-engine jet airliner designed and manufactured by Boeing Commercial Airplanes, the commercial business unit of Boeing. Emirates is the largest operator of the Boeing 777 with 148 aircraft, having operated each 777 family variant.

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