Officials from NIPSA and Unite said they were shocked by Tuesday’s airport announcement.
Trade union official Alan Law said: “The news that Ryanair are reducing the flights from March 2017 is devastating. The discussion with Mr Kelpie and Mr Devine was very positive and I wish them well in their continued efforts to secure replacements.
The impact of Air Passenger Duty continues to disproportionately affect the airport.”
“This remains a huge issue which local politicians need to grasp.
“The airport is popular with the local customers, it is essential for regional connectivity in the North West and I hope that the NI Executive show the same level of commitment to protecting this important economic driver as they have done for the transatlantic route from Belfast International.”