The first is in honour of Qatar Airways achieving a 50-strong fleet of aircraft in 2006, with the second stamp celebrating the airline adding its 100th destination to its global route map in 2011. The third design highlights Qatar Airways becoming the Global Launch Customer of the world's very first Airbus A350-900 in 2015, while the fourth stamp pays tribute to two of the airline's latest successes in 2017: reaching its 20th year anniversary and being awarded 'Airline of the Year', for the fourth time, by Skytrax. Qatar Airways Group Chief Executive, His Excellency Mr. Akbar Al Baker, said: "Qatar Airways is proud to commemorate its 20th anniversary by sharing these symbolic stamps with the people of Qatar. The stamps celebrate Qatar Airways exceptional expansion as the fastest-growing airline in the world. "Through these mementos, we express our pride in being Qatar's national carrier and in having reached so many major milestones within the airline's short presence in the industry.