As we go behind the scenes of the world's smiliest airport, we meet the Far East's happiest Immigration officer and a laughing doctor who has his patients in stitches. But not everyone is smiling - Melody has lost her passport, and Matt cannot get back to Yorkshire. John's trip around Asia hits the skids, and after a big night out in Departures, will Paul make it to the gate? Written by Allister Coots

The staff are being extra specially nice on the eve of the annual airport awards. Everybody wants to win the coveted award for customer service, but not everyone is impressed by the customer care that they are getting - Kosmos and Harry can't get a flight back to London, and Will is left high and dry after a night on the town, but he only has himself to blame. The medical team rally around when a British backpacker puts his foot in it, and we meet an airport doctor who is so popular that he has his own fan club. Written by Allister Coots

All hell breaks loose at Police HQ when Louise loses her daughter. There is confusion in Customs as Elena tries to bring in a cat. Captain A leads a crackdown on queue-jumping in Immigration. A Cambodian monk loses his sister.

All you need is love when Bangkok Airport celebrates one of the biggest days in the Thai calendar, Valentines Day. Romance blossoms for Immigration officers Captain Bert and Officer Nat. Nathan has a surprise in store for his mum and dad. Will a nip and tuck help Justin to land the girl of his dreams? Written by Allister Coots

We look at what happens when people can't get out of Bangkok Airport. A panic attack grounds Sarah in Departures. Army veteran John is down to his last 10 baht. An Indian tourist is detained by the Tourist Police.

Trouble is brewing at the airport of smiles. As protesters take to the streets, the airport grinds to a halt. A Full Moon party goes horribly wrong for two young backpackers. An unhappy tourist is spoiling for a fight at Tourist Police HQ.