I don't know about the colouring books Scout. Mine will rarely tolerate colouring in for reasons I cannot fathom as I love it always used to love it when I was little.
I would say the Airport book would keep him going for a long time though, unless he is some kind of super speedy stickerer 
We have 2 crates on our landing full of activity books as my dmum has a bit of a passion for them. When we were dcs they were a HUGE treat and totally savoured as my dparents were not that wealthy when we were little.
My dmum has bought my dcs so many though that they sit upstairs with guilt written all over them.
I used to donate them to the nursery so that they would at least get used but now they are aimed at an older age group and my dcs can talk coherently I am too chicken to give them away.
I have begged my dmum to stop it though, after a holiday we went on together where she produced one each every day of the trip (a week) and I was expected to manage them all or my ddad got cross about the mess [stress]
She has got the message and has vastly reduced her donations. I do feel a bit bad for her because she obviously remembers what a thrill we got from them as dcs. Part of the thrill was the novelty factor though.
Anyway, sorry, I digress. 