The journey, made two to three times daily from Loganair, connects Westray, an island on the edge of Scotland's northerly Orkney archipelago, to the smaller, even more remote island of Papa Westray.

This, according to Guinness World Records, is the world's shortest scheduled airline service, a trip that covers just 1.7 miles (2.7 kilometers) in less time than it takes most passenger airplanes to reach cruising altitude. 
On a good day, with favorable winds and light luggage, it takes 53 seconds.

https://edition.cnn.com/travel/article/worlds-shortest-flight-orkney-scotland/index.html

This topic was covered already by Martin!  Sorry about any confusion yesterday!