Ryanair chief executive Michael O'Leary will announce a proposal today for "vertical seats", which will provide standing-room spots on short-haul flights for a cost of about £5 ($A8.90).

Asked today whether it would consider a similar proposal, Tiger Airways said selling cheap fares meant continually having to innovate and evolve to reduce the cost base.

"Tiger Airways doesn't rule anything out," the budget carrier's Australia commercial director, Steve Burns, said.

Mr Burns said while there were no immediate plans for vertical seating, "we continue to look at ways of making our operation more efficient so we can offer even lower fares than we do now".

"Everything we do is about offering the lowest possible fare then allowing our customers to choose what, if any, extras they wish to pay for," he said.

Mr O'Leary told ITV's How To Beat the Budget Airlines program Ryanair would convert the back 10 rows of seats into standing area.

"We are aiming at starting safety testing in about 12 months with a view to going into service with the new arrangements in about 18 months to two years' time," a spokesman told The Guardian.

"We think this would work well on our winter services so would hope to eventually introduce it for a winter timetable."

However, the newspaper reported that safety officials at the European Aviation Safety Agency said the plan was unlikely to pass the regulator's requirements.

Aircraft manufacturer Boeing has already rejected Ryanair's controversial plans once, but the airline says it has re-entered talks over its proposals.

Ryanair has dismissed claims it is only seeking publicity and is not serious about the proposals.

The airline said the same claims were made two years ago when it announced it would remove its check-in desks from airports. It removed the last of its check-in desks in October last year.

Ryanair has also repeatedly raised the possibility of charging passengers to use the toilets on flights lasting less than an hour.

Jetstar and Virgin Blue have been contacted for comment.