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Amsterdam-Schiphol International Airport (AMS/EHAM)
Kuala Lumpur Interntional Airport (KUL)
Narrative: An IndiGo Airbus A320, registered VT-IFO, and a KLM Boeing 787-9 Dreamliner, PH-BHG, were involved in a serious airprox incident over India. IndiGo flight 6E977 departed Delhi, India at 18:25 UTC on a domestic flight to Bangalore. The aircraft was operating on ATS route Q23 and climbing to FL350. While crossing ATS route L333 East of waypoint INTIL, it came in close proximity with flight KL811 en route from Amsterdam to Kuala Lumpur. The KLM Dreamliner was following route L333, at FL350. The required standard lateral and vertical separation was reduced to 3.6 NM (6,67 km) and 200 feet (61 m) respectively. Vertical separation was re-established when the IndiGo flight descended passing FL342 for FL340 and KL811 was climbing passing FL353 for FL360.
The AAIB India classified the occurrence as a Serious Incident and started an investigation.