A submission from former parliamentarians arguing they should keep their taxpayer-funding perks has been removed from the Parliament's website after a request for it to be kept secret.

Sources were unable to confirm who asked on Monday that the submission, made to a Senate inquiry into the Abbott government's proposed changes to the Gold Pass Scheme, be kept from public scrutiny. The scheme allows former MPs some travel on the public purse.

At least 50 flights have been cancelled this week due to the heatwave.

The Association of Former Members of Parliament of Australia's submission argued that stripping back their perks would be "unconscionable" and "unconstitutional".

The submission was uploaded to the Senate inquiry's website on Friday and taken down on Monday hours after The West Australian reported its contents.