Apart from this limited license, we don't grant you every other legal rights or license with regard to this Site; any rights or license not expressly granted herein are reserved. What is a fifth liberty route? A fifth flexibility route is the place an airline has rights to hold revenue https://businessflightshop.co.uk/blog/how-to-acclimatize-to-a-cruise-trip-if-you-are-a-first-timer/