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　　The Boeing 777 was designed to fill the gap between the Boeing 767 and the 747 and has since become one of the most popular aircraft models in history. The aircraft was first unveiled in April 1994 and made its maiden commercial flight for United Airlines on this day (June 7th) in 1995.

　　The widebody aircraft is a staple of airlines around the world. Over 1,600 of the jets have been produced so far across several variants. The most popular model is the 777-300ER, representing almost half of all 777s delivered. There is also a freighter version of the aircraft, and a next-generation model with folding wingtips is currently undergoing testing.

　　Korean Air currently holds the top four spots in terms of flight cycles. Its most-flown Boeing 777s have each flown over 23,000 flight cycles each. The aircraft all originate from a September 1995 order and have flown with the carrier for their entire time in service. Three of the Boeing 777-300 aircraft were registered sequentially (HL7532, 33, and 34), with deliveries beginning in August 1999. The fourth aircraft (HL7573) was delivered the following year.

　　In fifth place is a Boeing 777-200ER (RA-73331) currently operating for a Russian regional leisure airline Red Wings Airlines, based in Moscow Domodedovo Airport. The aircraft began its commercial life at Emirates as A6-EML in November 1998 and later served with VMI Airlines and IrAero.

　　Long-haul jets generally complete more hours than flight cycles and can easily surpass the six-figure mark in terms of flight hours. As far as active Boeing 777s go, the top two slots belong to a pair of Austrian Airlines aircraft.

　　Taking the cake across the board is the flag carrier's Boeing 777-200ER registered OE-LPA with 120,940 recorded flight hours. The aircraft entered service in September 1997 with Lauda Air before joining the Austrian Airlines fleet in 2004. In second place is another ex-Lauda -200ER registered OE-LPB with 116,537 hours in the air.

　　The following two positions belong to aircraft operating for British Airways. The oneworld carrier has two Boeing 777-200ERs (G-VIIP and G-VIIR) that have flown over 115,000 flight hours each. Both aircraft come from the original British Airways order and entered service in February and March 1999, respectively. British Airways 777s also rank at #6 and #9 of the top ten for most hours in the air.

　　United Airlines, the first carrier to fly the Boeing 777 commercially, comes in at number five with its Boeing 777-200ER registered N78009. The aircraft has flown over 113,000 flight hours since its commercial debut under the Continental Airlines brand in April 1999. The Star Alliance carrier is a prolific operator of the type, and 33 of the carrier's Boeing 777s have flown over 100,000 flight hours.

　　The end is far from near for the widebody family. Boeing is currently testing its 777X product to meet the continuing needs of airlines worldwide. The program consists of the Boeing 777-8 and Boeing 777-9 in addition to a freighter variant. The 777-9 is the larger of the two and will become the largest and highest-capacity twin-engine aircraft to date.

　　The freighter version is still in development, with an expected first delivery date of 2027. It will compete directly with the Airbus A350F and serve as a replacement for aging Boeing 747 freighters in fleets across the world. Expected early customers include Ethiopian Airlines, the Lufthansa Group, and Cargolux.