entered service with Mexican Interjet on 18 September 2013; in their first four weeks, the first two aircraft operated were flown 580 times over 600 hours with a daily utilisation of 9.74 hours and a dispatch reliability of 99.03%. By June 2014, Interjet had received seven SSJ100s and the dispatch reliability had increased to 99.7%. On 12 September 2014, Interjet started regular passenger flights to the US, on the Monterrey, Mexico, – San Antonio, Texas, route. On 3 June 2016, the Irish carrier CityJet was the first western European airline to take delivery of an SSJ100. Dependability On 24 December 2016, the Russian Federal Air Transport Agency grounded seven jets after a tail component of an IrAero SSJ100 showed metal fatigue, leading Sukhoi to inspect the entire fleet. By 27 December, all aircraft had been inspected and it had been shown that the defect was not systemic as it featured multiple redundancies and a safety margin doubling the normal loads. Interjet grounded half of its fleet of SSJ100s during this period, but all of its aircraft were returned to service by the first week of January 2017 after Sukhoi sent 22 technicians to repair the grounded aircraft. In June 2017, dispatch reliability increased to 97.85% from 96.94% a year earlier, while there were 89.6 malfunctions per 1,000 flight-hours, down by 40%. On 21 July 2017, following the discovery of horizontal stabiliser rear spar cracks, the EASA mandated compulsory inspections. Sukhoi recognises it needs to improve customer support with more responsiveness and availability for flight training, engineering and spare parts supply. In early November 2017, the Russian Federal Air Transport Agency and Italian Civil Aviation Authority (ENAC) amended their bilateral airworthiness agreement, hitting SSJ export sales. Interjet claimed its capital cost for 10 Superjets was equivalent to the pre-delivery payment for one Airbus A320. The pre-delivery payment amounts to 15-30% of an aircraft list price. An A320 list price was $88.3M in 2012. In January 2018, Bloomberg reported that four of Interjet's 22 SSJ100s were being cannibalised for parts to keep others running after having been grounded for at least five months because of SaM146 maintenance delays. This was later refuted by Interjet. One grounded SSJ100 was due to be back in service on 19 January 2018 and the remaining three in March. In August 2018, Russian regional carrier Yakutia Airlines considered withdrawing their SSJs, after two were grounded because their