The Max is getting delayed

It also seems more and more apparent that Boeing will not be able to certify its MAX 10 aircraft by a year-end deadline, but it remains possible that U.S. lawmakers could give it more time.

Boeing faces a late December deadline to win approval for the 737 MAX 10, which can hold 230 passengers, otherwise, it must meet new cockpit alerting requirements under a 2020 law unless waived by Congress.

Boeing Chief Executive Dave Calhoun in July during an investors call threatened to cancel the Max 10 in case they do not get a waiver. "I think Boeing accepts that it won't get certified by yearend, but I suspect that Congress will approve an extension to that certification process out into early 2023," Ryanair Group Chief Executive Michael O'Leary told the media. "It makes no sense to call on a company like Boeing to redesign the cockpit or redesign safety systems... So I would urge Congress not to demand a redesign," he added.

Ryanair last year cancelled negotiations with Boeing for 200 of the MAX 10 but has never fully walked away from a possible deal.

A Federal Aviation Administration (FAA) spokesperson said the agency does not "comment on ongoing certification projects. Please ask Boeing about their schedule". In a statement, Boeing said it was "working transparently with the FAA to provide the information they need, and are committed to meeting their expectations and those of our customers to certify and deliver the 73710. Safety remains the driving factor in this effort," Boeing added.

Sky-high rents hit the aircraft market as Boeing jets top $300,000 a month.

Passengers aren't the only ones paying more to fly this year.