The transport secretary will meet the head of air traffic control (ATC) provider NATS on Thursday after a system outage grounded flights across the UK.
NATS, which has apologised, said it had taken 20 minutes to resolve the issue by switching to a back-up system, and systems were fully operational within an hour.
Airlines are demanding answers after more than 150 flights were cancelled on Wednesday and thousands more were grounded. One travel expert told the BBC the disruption could last for days.
NATS chief executive Martin Rolfe has been under pressure over previous ATC failings, after an issue in 2023 caused mass disruptions.
Transport Secretary Heidi Alexander said departures at airports across the UK resumed on Wednesday evening and NATS was working with airports and airlines "to clear the backlog safely and look after passengers."
