As many as 170 Heathrow baggage workers are threatening to walk out next month in a dispute over pay.
The Unite union warned of two waves of industrial action involving baggage carousel workers over 13 days in October, coinciding with the start of autumn half-term for many schools.
Strikes are planned from 5.30pm on October 6 until 6am on October 9 and then from 5.30am of October 20 until 6am on October 30.
The workers conduct maintenance and servicing of baggage carousels at the airport.
The strike threat follows the rejection of two below-inflation pay offers of 5% and 2.5% by employer, equipment supplier Vanderlande Industries.
Unite general secretary, Sharon Graham, said: “Workers at Heathrow airport employed by Vanderlande do a safety and security critical role that passengers depend on. The fact that their employer refuses to recognise this, as shown by their pitiful pay offer, speaks volumes.
“Our members will have the full support of their union as they head to the picket line in their fight for a fair pay rise.”
Travel Weekly has approached Vanderlande for comment.