The pilot, who spoke on condition of anonymity, also said that a number of people working for the airline are "outraged" and "furious" with its chief executive Michael O'Leary.
But in the letter he urges pilots to stay with Ryanair "for a brighter future".
Numerous airline's 4,200 pilots had joined unions over the past two weeks over discontent with the disruptions caused by the rota changes.
Charges unsealed in thwarted 2016 plot for attacks in New York City
Terrorists planned to kill people in Times Square, concert venues, and the subway system but fell foul of undercover agents. Talha Haroon would have planned to arrive in the United States at the last moment to help perpetrate the attacks.
Ryanair is facing a crisis after this acompana changed the timing of the accrual of leave during the year to meet the new aviation regulations, and this has led to a shortage of pilots.
However, one Ryanair pilot who contacted the BBC, said: "It's the standard".
Amid an exodus of pilots to competitors, Ryanair has written to cockpit crews offering to boost their pay and conditions.
Asked by an investor at the September 21 meeting if he had made changes to the rostering department, O'Leary said that it was "not the time to be taking people out and shooting them".
Sheriff: Las Vegas Shooter Planned To Escape
Unfortunately, Paddock decided that he'd carry out his heinous act during the Route 91 festival in Las Vegas on October 1. He said that it was hard to believe that the weapons and ammunition found in his possession were acquired by him alone.
He also offers pilots a bonus of €12,000 (£10,700) and promises he will exceed the pay deals offered by rival airlines.
The carrier announced its first batch of more than 2,000 cancellations across September and October, after rearranging pilots' rosters to meet new aviation rules meaning a change in how their flying hours are logged.
More than 700,000 passengers' travel plans have been affected by what Ryanair boss Michael O'Leary admitted was a "cock up".
Mr Hickey, who has been at the budget carrier for almost 30 years, will leave at the end of the month.
Ghana appeal for rematch
Asamoah Gyan, who could not feature in the game due to an injury tweeted hours after the game that "we have to protest". The GFA were furious with the conduct of the officials and said television replays had shown it was a " perfect goal ".
Referencing the cancellations announced last month, he apologised personally and said there had been "poor planning" during the airline's "rostering failure".