Heathrow Airport
The man was believed to have been on a flight from Nairobi to Heathrow.
A spokesperson from activist group Heathrow Pause said Hallam would fly a drone near the airport at midday.
Two people have been arrested around Heathrow Airport after climate-change activists had planned drone protests. The men were arrested Friday morning on suspicion to commit a public nuisance, the Metropolitan Police said. Heathrow Pause, a splinter group of the Extinction Rebellion movement, but separate from it,had intended to cause flight disruption by flying the devices in the 5km exclusion zone.
Environmental protest group, Heathrow Pause, shared a livestream showing two people struggling to get a drone into the air.
The group has vowed to ground flights by flying toy drones into the airport's exclusion zone on Friday.
Highs of 33.2C made it the hottest late-August Bank Holiday of all time.
Flights leaving Heathrow and Gatwick have been affected by the fault, which was resolved on Wednesday afternoon.
“People were crying and hyperventilating. It was genuinely scary."
The two sides have been meeting throughout the weekend under the chairmanship of the conciliation service Acas.
The climate change campaigners cited "division" across its members for the decision.