As a regular user of Teesside Airport (15 trips or so this year) I am used to paying around £300-£600 for flights to Europe via Amsterdam for work (in economy).
Me and the missus were looking for somewhere to go for a weekend in October and for a giggle I searched for Teesside-Amsterdam and got a price of £97 return each including taxes. This was out on Friday back on Sunday with a choice of flight times.
Seems obvious that KLM would offer good deals to Amsterdam at the weekend given the bias of the KLM flight towards business users who are normally flying the other way but I was surprised that there is no publicity of a £97 return weekend flights in the local area.