Aircraft Accident Investigation Bureau (AAIB), in a probe report into an airprox incident involving two IndiGo planes, has recommended that aviation regulator DGCA carry out an inspection to assess the effectiveness of airlines' safety management systems. In its 35-page final investigation report into the incident that happened in the Delhi airspace on November 17, 2023, the probe agency said that non-adherence to the Standard Operating Procedures (SOP) by the crew of one of the flights was one of the probable reasons for the incident, while the airline's failure to take timely action despite repeated SID-related occurences prior to the particular incident was a contributing factor. Generally, airprox refers to two aircraft coming closer than the permitted distance between them, and Standard Instrument Departure Route (SID) pertains to the route that an aircraft takes from the take-off to the enroute phase. IndiGo's A321 aircraft operating flight IGO2113 from Delhi to Hyderabad and