Yawn for a free coffee and other ways advertisers are getting smart at airports

By Daisy Carrington, for CNNUpdated 2nd October 2013
Douwe Egberts marketing campaign used 'yawn recognition' technology.
Heineken's 'Change of Plans' campaign at JFK airport
Heineken's 'Change of Plans' campaign at JFK airport
Wieden + Kennedy
Yawning for a coffee in OR Tambo gained plenty of social buzz.
Yawning for a coffee in OR Tambo gained plenty of social buzz.
From Joe Public