Ryanair has told pilots that if they do not accept proposed pay increases - with no negotiation through unions or joint representative bodies - they may not get any increases for up to five years.
Ryanair has previously said that while it will negotiate with individual local Employee Representative Councils, it will not talk to the centralised European Employee Representative Committee (EERC), which pilots are currently trying to form to boost their bargaining power.
In an update, Ryanair's Chief People Officer Eddie Wilson states: "We will not enter into writing or meetings, with competitor airline pilots/unions, or whatever they call themselves this week (RPG/REPA/EERC?) whose sole aim is to prevent you from accessing a big pay increase next month, through the existing ERC structure."
He notes that the Supreme Court ruled that the current ERC structure was an "acceptable and lawful" forum for pilots to collectively negotiate with the company - and that some existing local base agreements approved by pilots in secret ballots are set to run up to 2022.
He describes previous attempts to organise pilots in 2004 and 2012 as "defunct".
He says that since 1 January this year, Ryanair has recruited over 830 new pilots, with over 210 receiving their wings in the last 12 weeks alone.
He also confirms that the new improved terms and conditions will continue to be offered to new recruits, including any from troubled airlines Monarch, Alitalia and Air Berlin.
Mr Wilson says the latest pay offer to Dublin pilots would see them earning 22% more than Norwegian from November, with Ryanair pilots earning up to €156,150 compared to €128,000 at Norwegian.
He told the pilots they will get annual pay rises of up to €22,000 from November, but acknowledges that not all bases will receive the same figure.
However, he warns that if there is no agreement at a base to vary existing local agreements, Ryanair will still offer the improved pay and conditions to all new direct entry recruits, as they intend to make Ryanair pilots the best paid operators in the low cost sector in Europe.
He also notes that if agreement is not reached, pay increases may be delayed "until December, or next year, or not delivered at all".
The proposals would see pay rises of up to 22% to pilots based at Stansted, where Ryanair has been experiencing recruitment and retention difficulties.
However, as yet it is unclear if identical deals will be offered to pilots at all Ryanair's 86 other bases, where many pilots are currently joining unions in a bid to secure better employment terms.
Ryanair does not recognise unions and has pledged to resist any attempt by pilots to be represented either by external unions, or by a proposed joint in-house body comprising all the ERCs.
The new Stansted pilot pay rates will apply from 1 November, but only if accepted by Friday 20 October.
The deal, which will supplement a current agreement negotiated in 2014, also includes promises of an unspecified number of additional direct employment contracts for some pilots.
Captains would see their total pay rise by 22% from £111,482 to £135,615, first officers would see a 20% pay hike from £58,158 to £69,658, remuneration for Line Training Captains would increase 20% from £125,982 to £151,615, while Type Rating Examiners earnings would grow from £140,229 to £167,362.
Ryanair also informs pilots that two increases of £1,000 each due in April 2018 and April 2019 provided for in the original 2014 agreement are included in the basic pay increases payable from 1 November 2017.
There will also be a new ‘Command Upgrade Incentive Scheme’ for co-pilots of up to £20,000.
The management document notes that the deal is underpinned by a Ryanair commitment to benchmark their pay with local 737 operators, most notably Jet 2 and Norwegian, and states the offer would put Ryanair Stansted captains between 20% and 26% ahead of those comparable competitors.
Ryanair also pledges to increase resources in their crewing, rostering and bases management infrastructure, and to implement a new leave system from January 2019.
A similar deal has been offered to pilots in Madrid.
First officers will see pay rise 20% from €63,605 to €75,105, captains' earnings will increase from €130,479 to €154,479, a line training captain from €142,979 to €168,479 and a type-rating examiner from €161,830 to €188,672.
The Madrid offer also includes the promise of an unspecified number of additional direct employment contracts.
However, it differs from the Stansted offer in that it reiterates that Ryanair contracts will continue to be governed by Irish law.
It states: "The company will negotiate with the Madrid ERC any differences between Irish and Spanish individual employment benefits (eg sick pay, maternity, probation etc) into our Irish employment contracts.
"The Madrid ERC should set out any such differences between Spanish and Irish legislation. Any terms negotiated will not change the fact that crews will continue to be employed on Irish contracts of employment or that Irish law will be applicable to these amended contracts."