Airport chiefs in Yorkshire say they plan running “near normal” operations despite a strike by 130 staff being escalated to cover school half-term.
Thousands of passengers at Leeds Bradford Airport will be affected in the action by the union Unite.
Its members will now walk out between October 23 and November 2 in addition to previously announced strikes between this Friday and Sunday in a dispute over pay.
Unite has previously claimed the stoppage involving a mixture of workers including air traffic controllers, security staff, passport control personnel and cleaners will bring the airport to a standstill.
Bosses at Leeds Bradford Airport accused the union of “aggressive tactics”.
In a statement, the airport said its priority was to minimise disruption for travellers.
“We are disappointed by this escalation and do not believe strike action is the right way to resolve the issues that remain under discussion,” it said.
“The airport has made a fair and responsible offer that is significantly above inflation and reflects both the current challenging economic conditions and the need to ensure the long-term sustainability of the business.
“These aggressive tactics serve no purpose and only create uncertainty for the hard-working customers of Leeds Bradford Airport who are looking forward to enjoying time away with family and friends during the upcoming half-term break.
“At this stage, we anticipate running near-normal operations during the periods of industrial action.”
It added: “Leeds Bradford Airport plays a vital role in connecting Yorkshire to the world.
“Industrial action has the potential to cause inconvenience for thousands of customers and local businesses who rely on those connections.”
Unite has previously predicted the action will lead to a shutdown at the airport due to the impact on air traffic control and passport checks.
It claimed pay for staff in some departments had fallen behind those at other airports and staff had been left with no choice but to strike.
Officials said the airport was “very profitable” with growing passenger numbers. Its members were a “major part” of its success and deserved a fair pay rise.
Unite general secretary Sharon Graham said: "It is wrong that workers at Leeds Bradford Airport are paid far less than those doing the same job at another nearby airport.
"These are essential workers who play a vital role in ensuring the smooth running of the airport and the safety of passengers and deserve fair pay. Unite will always fully back our members taking action at Leeds Bradford Airport.”
Unite regional officer Neil Whitaker said: “We appreciate those travelling to and from Leeds Bradford Airport will be concerned to hear that there are further strike dates, but the situation is completely the fault of the airport’s management. It can end this dispute, but that relies on it coming back to the table with a fair deal for our members.”