Transavia, who will fly you to or from Rotterdam/The Hague - which is, I presume, the same airport as Amsterdam (Rotterdam). Rotterdam was often my airport of choice for flying to London when I lived in Amsterdam - it was often the cheapest way before the modern budget-airline trend began, and it's a tiny airport you can get through in a few minutes (or could in those days). It's about 75km from Amsterdam though (about the same distance as from Hamburg to "Hamburg Lübeck" airport).
Yes, Selva. I'm sure my friend would have considered it an option were it not for the effrontery of the airline in calling Rotterdam
airport, of all places, Amsterdam. I'm told the rivalry between the two cities is analogous to Liverpool/Manchester, Newcastle/Sunderland or Edinburgh/Glasgow.
While on the subject, I've always found it odd that arch-fantasist Ryanair doesn't call either of its Netherlands airports 'Amsterdam'. Eindhoven and Maastricht are both a long way from Amsterdam, but not nearly as far as Weeze is from Duesseldorf or, as ollie observes Hahn from Frankfurt.