Empty legs are flights which are scheduled to fly without passengers, usually back to their home base or to their next destination in preparation for their next charter flight. Empty flights are inefficient for aircraft operators to carry out, as they do not make a profit from these journeys. Finding an empty leg for your journey is a cost-effective way to hire a private jet, as charter operators usually sell these flights at up to 75% off the original charter price. However, it is often very challenging to find an empty leg flight specific to your journey, in terms of the location you want to depart and arrive at, and the times you wish to take-off and land. In fact, in Europe alone there are 4,437,432 different airfield combinations meaning the odds of finding an empty leg travelling from your location to where you want to go is basically zero.