You can see it every time you step off a plane or a train and meander to a busy taxi rank.

BBC: Communal cabbing

As you step off the plane, there is a wash of good feeling, of optimism, of excitement, of love for country.

FORBES: One Wonderful Day in South Africa

Step onto a plane at Osaka's Kansai airport or Bangkok's Don Muang terminal and chances are you will be walking across an airbridge built by Bukaka.

CNN: HOW TO BUILD A FORTUNE

From then on it just got better and better, before I knew it we were all on a plane heading for Namibia and the Next Step youth conference.

BBC: Namibian trip a real eye-opener

The Spanish start-up ChangeYourFlight enables travellers to make requests for partial refunds of plane tickets they know they are not going to use via a free, three-step process.

BBC: New sites let you sell unused trips