Monday's strike by staff working at Heathrow Airport has been suspended to allow for further talks, the Unite union has said.
Some 2,000 staff were due to walk out from one minute past midnight for 48 hours – affecting thousands of passengers.
The two sides have been meeting throughout the weekend under the chairmanship of the conciliation service Acas.
But on Sunday evening, Unite said in a brief statement: "Tomorrow's strike by Unite members working for Heathrow Airport has been suspended to allow for further talks at Acas tomorrow.
"Under the chairmanship of the conciliation service Acas, tomorrow's talks will involve senior directors from Heathrow Airport and senior Unite officials with the aim of averting a second day of planned strike action set to start at 00:01 and finish at 23:59 on Tuesday 6 August.
"Unite will not be making any further comment while talks are ongoing."
Heathrow has already cancelled around 177 flights on Monday and Tuesday, causing disruption to passengers.
But the scale of disruption would have been worse if Monday's strike had gone ahead.
Passengers are being urged to check with their airline for the latest news on flights.
Unite members, including security staff, firefighters and engineers have voted heavily against a pay offer Heathrow said was worth 7.3% over two-and-a-half years.
Additional reporting by PA
