What are empty leg charter flights? Empty leg flights occur when an existing client requests a one-way trip. One-way private jet charters may be flying to or returning from transporting a client. Either way, the private jet is empty on one of its legs. This is good news for anyone who needs to charter a plane because empty legs are a frequent occurrence. In fact, empty leg charter space has become available on all of the flights below. Take advantage of the savings and charter a private jet today.