Hmm not really - I fell fowl of that one! What they were doing was charging 20 Euro EXTRA if you DIDN'T pay with Mastercard. If you looked carefully you'd see that the headline price suddenly increased by 20 Euro at that screen in the hope that you'd be distracted by the discount and wouldn't notice. They added the extra 20 euro in as unspecified 'airline and airport taxes' and then deducted it again for some people. Totally illegal and a desperate attempt to increase revenue before they rightly went bust. I have screenshots to back this up, if you're interested, but there's probably no point worrying about it now, they're history...