On 14 September 2022, a Boeing 787-9 inbound to Mumbai lost separation against a Boeing 787-8 also inbound to Mumbai on the same airway when it began a descent from FL410 to FL340 at night without clearance close to an air traffic control sector boundary. ATC soon observed the error but a delay in achieving contact with the 787-9 resulted in it descending to FL389 before being instructed to return to its cleared level. As it passed through FL390 descending and then again when climbing, it came within 3nm of the same-direction 787-8 which was level as cleared at FL390.