"it just seemed really happy in the air...all the things we were testing had no major issues at all." It flew for four hours, reaching Mach 0.8 at 25,000 feet after retracting the landing gear and starting a 2,500 h flight test campaign. Costs for developing the aircraft were estimated at €11 billion (US$15 billion or £9.5 billion) in June 2013. A350 XWB msn. 2 underwent two-and-a-half weeks of climatic tests in the unique McKinley Climatic Laboratory at Eglin Air Force Base, Florida, in May 2014, and was subjected to multiple climatic and humidity settings from a high of to as low as . The A350 received type certification from the European Aviation Safety Agency (EASA) on 30 September 2014. On 15 October 2014, EASA approved the A350-900 for ETOPS 370, allowing it to fly more than six hours on one engine and making it the first airliner to be approved for "ETOPS Beyond 180 minutes" before entry into service. Later that month Airbus received regulatory approval for a Common Type Rating for pilot training between the A350 XWB and A330. On 12 November 2014, the A350 received certification from the FAA. On 1 August 2017, the EASA issued an airworthiness directive mandating operators to power cycle (reset) early A350-900s before 149 hours of continuous power-on time, reissued in July 2019. Entry into service In June 2011, the A350-900 was scheduled to enter service in the first half of 2014, with the -800 to enter service in mid-2016, and the -1000 in 2017. In July 2012, Airbus delayed the -900's introduction by three months to the second half of 2014. The delivery to launch customer Qatar Airways took place on 22 December 2014. The first commercial flight was made on 15 January 2015 between Doha and Frankfurt. The first A350-1000 was assembled in 2016 and had its first flight on 24 November 2016. The aircraft was then delivered on 20 February 2018 to Qatar Airways, which had also been the launch operator of the -900. and entered the commercial service with a flight from Doha to London on 24 February 2018. Shorter A350-800 The -long A350-800 was designed to seat 276 passengers in a typical three-class configuration with a range of with an MTOW of . In January 2010, Airbus opted to develop the -800 as a shrink of the baseline -900 to simplify development and increase its payload by