Alongside improving the design of airports, providing simpler wayfinding, and making the security process less stressful, the ever present smartphone seems to be the battleground for providing better information to the passenger at a number of points on the journey.
This article from the Amor Group presents a good summary of the current applications and uses for smartphone technology. Worth a quick read:
Smartphones as an Enabler for Improved Passenger ExperienceLabels: airport security, airport terminal, aviation, innovation, interaction, passenger experience, passenger information