A330 reliability by early 2019. By the end of May 2016, the A350 fleet had flown 55,200 hours over 9,400 cycles at a 97.8% operational reliability on three months. The longest operated sector was Qatar Airways' Adelaide–Doha at 13.8 hours for . 45% of flights were under , 16% over , and 39% in between. The average flight was 6.8 hours, with the longest average being 9.6 hours by TAM Airlines and the shortest being 2.1 hours by Cathay Pacific's. It is to seat from 253 seats for Singapore Airlines to 348 seats for TAM Airlines, with a 30 to 46 seat business class and a 211 to 318 seat economy class, often including a premium economy. A total of 49 A350s were delivered to customers in 2016. It was also planned that the monthly rate would grow to 10 by the end of 2018, which was eventually achieved in 2019 when Airbus delivered 112 aircraft over a period of 11 months. In January 2017, two years after introduction, 62 aircraft were in service with 10 airlines. They had accumulated 25,000 flights over 154,000 hours with an average daily utilisation of 12.5 hours, and transported six million passengers with a 98.7% operational reliability. Zodiac Aerospace encountered production difficulties with business class seats in their Texas and California factories. After a year, Cathay Pacific experienced cosmetic quality issues and upgraded or replaced the seats for the earliest cabins. In 2017, average test flights before delivery decreased to 4.1 from 12 in 2014, with an average delay down to 25 days from 68. Its reliability was 97.2% in 2015, 98.3% in 2016, and 98.8% in June 2017, just behind its 99% target for 2017. In June 2017 after 30 months in commercial operation, 80 A350s were in service with 12 operators, the largest being Qatar Airways with 17 and 13 each at Cathay Pacific and Singapore Airlines (SIA). The fleet average block time (time between pushback and destination gate arrival) was 7.2 hours with 53% below , 16% over , and 31% in between. LATAM Airlines had the longest average sector at 10.7 hours, and Asiana had the shortest at 3.8 hours. Singapore Airlines operated the longest leg, Singapore to San Francisco , and the shortest leg, Singapore to Kuala Lumpur . Seating varied from 253 for Singapore Airlines to 389 for Air Caraïbes, with most between 280 and 320. On 30