London Terminal Control Area northeast of Heathrow, United Kingdom
Two Unknown Objects Over the London TMA in Thirty-Two Minutes
On 8 May 2026 two Heathrow departures reported close passes with unknown objects 32 minutes apart in the London TMA. At 17:51 an A320 at FL090 saw a black-and-white object about 50 by 30 cm pass within ~100 ft; at 18:23 an A321 at FL145 reported a featureless black object of significant size at an e
Why This Case Matters
An unusually strong modern aviation pair: professional aircrew, immediate ATC reports, formal UKAB assessment, radar replay and close-separation estimates in controlled airspace.
Chronology
- 8 May 17:51 A320 reports unknown object at FL090 ~15NM NE Heathrow
- NATS radar review finds no associated contact
- 18:23 A321 reports significant black object near LAM at FL145
- NATS again finds no associated primary/secondary contact
- UKAB assesses 2026073 Risk B and 2026084 Risk D
The Witnesses
Evidence
The following evidence types are documented for this case:
Conventional explanations: Uncoordinated drones, balloons or airborne debris remain plausible. UKAB explicitly classified both as unknown objects because description/altitude were insufficient for determination; absence on radar does not exclude small objects.
What Remains Unresolved
- Identity and relation, if any, of the two objects
- exact shapes/material
- drone/balloon launch sources
- raw radar replay
- whether same-day proximity is coincidence.
Key Takeaways
- The events are very well documented as flight-safety encounters. UKAB's 'unknown object' classification is an identification limit, not an exotic-craft conclusion.
Sources
Primary and secondary sources for this case file: