"These threatened strikes can only damage Ryanair's business in Germany, and if they continue, will lead to base cuts and job cuts for both German pilots and cabin crew, particularly at some secondary German bases," sad the Irish no-frills airline's chief marketing officer Kenny Jacobs in a statement.
Without naming the German sites under threat, Jacobs said they are already loss-making during the winter season and could suffer greater losses if strikes continued.
Condemning the Cockpit pilots union's call for a 24-hour walkout that is expected to involve 400 pilots and co-pilots in Germany, Jacobs also rejected the charge that the airline is underpaying its staff.
Lufthansa's subsidiary Eurowings pay pilots 30 percent less, he claimed.
"It is unacceptable that a union representing Ryanair's German pilots, who earn up to 190,000 euros a year and work a five-day week followed by a four-day weekend, is now threatening customers travel plans at short notice and without consulting with our German pilots," said Jacobs.
Wednesday's stoppage came after a round of coordinated industrial action by pilots across Europe in August that forced the airline to cancel 400 out of 2,400 scheduled European flights during the peak summer holiday season.
Germany was worst hit by the August strike, with 250 flights scrapped at 10 airports.
But Germany's Cockpit union has rejected the deal.
Ryanair last year averted widespread Christmas strikes by agreeing to recognise trade unions for the first time in its 33-year history, but it has since struggled to reach deals with the workers' representatives.
The famously low-budget company boasts lower costs per passenger than its competitors and is eyeing profits of around 1.25 billion euros this year.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)