of which only five are operational, as it is no longer profitable to operate aircraft of this size in Mexico. Therefore, , Sukhoi has had trouble selling the Superjet and renewing leasing contracts outside of Russia because of reliability and service network issues, resulting in an average of 109 flight hours per month for Russian airlines, approximately half the Embraer EMB 170 productivity, and just a third of a Boeing or Airbus jet. Unease with the SSJ's low reliability also spread to Russian operators. Slow sales Sukhoi delivered only three SSJs in the first half of 2019; its financial results show a sevenfold drop in aircraft sales revenue and a fourfold drop in overall sales revenue, resulting in a 32% increase in its net loss. The company needs to achieve a production rate of 32 to 34 aircraft per year to make a profit, though demand for Russian models in the 60–120 seat category is forecast to be only 10 aircraft per year over a 20-year period. In the short-term, the company's main hope is that Aeroflot will firm up its 2018 preliminary agreement for 100 SSJs. Yamal Airlines, the second-largest Russian SSJ operator, announced the cancellation of its order for 10 further SSJs, citing high servicing costs. Of 30–40 SSJs owned by Aeroflot, only 10 are reportedly usable at a time due to maintenance problems. Aeroflot cancelled approximately 50 Superjet flights in the week following the Flight 1492 accident. Kommersant cited industry sources as saying the Superjet 100 had lower dispatch reliability than Airbus and Boeing aircraft in the airline's fleet historically and attributed a rise in cancellations to "increased safety measures" at Aeroflot while the accident is investigated. On 4 June, the Russian Federal Air Transport Agency (Rosaviatsiya) ordered carriers to perform one-time inspections of the SSJ, including a general check of the aircraft's condition and verification of aircraft and engine logs, by 25 June. A total of 12 jets were delivered in 2020 to the following operators: Rossiya Airlines, Azimuth Airlines, Red Wings Airlines. The sole remaining western operator, Interjet, down by the end of November 2020 to just four operational SSJ100s, quit flying in December 2020 and entered bankruptcy in April 2021. Part of Interjet’s plan was to try to return its 22 SSJ-100s to Sukhoi to cancel its debt, and resume flying with 10 Airbus A320 aircraft. In December 2020, Rossiya Airlines announced that it