As Pretty as an Airport

I’m sat at Birmingham airport waiting for my daughter to arrive with her boyfriend and that phrase keeps going around in my head. It might be from Dirk Gently or The Long Dark Tea-time of the Soul. Or is it from So Long and Thanks for all the Fish? Well he was right, no language has ever come up with the phrase,”as pretty as an airport.” What other phrases could be added? As cheap as Starbucks?