Basic fares for transatlantic WOW air flights are usually really low an include only a flight ticket and one small personal bag with dimensions 42x32x25cm and weight up to 10 kg. You need to pay extra for everything else: a normal size carry-on, checked baggage, seat reservation etc. Note that there is also no meal service unless you book Wow Premium fare, pre-order meal or buy snacks on board.
In Google Chrome or Safari, incognito is enabled by hitting Command (or “Control” if using PC), Shift, “N”. For Mozilla Firefox or Internet Explorer, hit Command (or “Control” if using a PC), Shift, “P”. This will open a new browser window where your information is not tracked, thus not inflating prices as you search. Note: if you're using an older version of OS X, open Safari then click “Safari” in the menu bar, and select “Private Browsing”.