I have flown twice to Dalaman with Th****n and there was no inflight entertainment, but then have flown with TC and you say you had entertainment and there was none on my flight so perhaps it depends on which plane they use?
Thomas Cook have taken off In Flight Entertainment now on most flights. They offer you the chance to hire a PSP for the flight at a cost of £7.50 which has movies and television programmes and also PSP games built into it.
I still prefer to read a book of my choice than watch most of the entertainment which is given on the flights, 4 hours is not such along travelling time.
I agree John V, I buy my books at WHSmith at the airport and start it on the airplane. I was asking re. the children, it keeps them a little occupied and often my little one will drift off to sleep.