take-off
Don't know much about advertising to be honest. However, common sense tells me that they are only going to give (up to) 80% off the flights they need to. The flights from Blackpool to Alicante at £119pp one way will almost be full. I had a quick look round and found seats available on various dates for £1 from Newcastle to Cork. Also, having a general browse I saw fares on other routes from £7.99, £14.99, £21.99 and so on. Some pretty cheap fares knocking around if you don't mind where and when you go. Normally these ultra low fares are only available to the people that book many months in advance.