In a wet lease arrangement, the financing entity, or lessor, provides the aircraft, and complete crew, maintenance and insurance (ACMI) to another party at a cost based on hours of operation over a set time period. The lessee pays for fuel, airport fees, duties, taxes and other operational costs. Wet leases generally are established for one to 24 months. (Any shorter period would be considered simply ad hoc charter, which can be thought of as wet lease by the hour or mission.) In the commercial airline world, wet leases are typically utilized to provide supplemental lift during peak traffic seasons or during annual heavy maintenance checks. In the United Kingdom, a wet lease is employed whenever an aircraft is operated under the air operator's certificate (AOC) of the lessor.

Because a charter flight is not part of a scheduled service, the flight will depart when you want it to.  You are also able to choose which cities you fly to and from.  Charter Flights are particularly convenient when you need to travel to a city where scheduled airline service may require multiple connections or layovers before you reach your destination.

With a charter flight, you rent the entire aircraft, rather than just one seat. The aircraft can be large or small, and flights can be one-way or round-trip. The charter could be made on a flight-only basis, might include ground services such as transportation to or from meetings or could be part of a complete vacation package. Charter flights offer more flexibility than scheduled flights, with a wider choice of destinations and tailor-made itineraries.
Like scheduled airline service, private jets also have weight limits with regard to the amount of luggage that can be stowed during a trip. Items such as skis and golf clubs are allowed as long as they conform to the dimensions and weight limits of the aircraft. These weight limits vary by aircraft type. Ask your charter sales representative if you have concerns about excess baggage or special items to be included in your luggage.
Because the cost of a high-end modern private aircraft may be tens of millions of dollars, lending for aircraft purchases is accompanied by a security interest in the aircraft, so that the aircraft may be repossessed in event of nonpayment. It is generally very difficult for borrowers to obtain affordable private unsecured financing of an aircraft purchase, unless the borrower is deemed particularly creditworthy (e.g. an established carrier with high equity and a steady cash flow).
In October 2017 Jetcraft forecasts 8,349 unit deliveries in the next decade for $252 billion, a 30.2 $M average. Cessna should lead the numbers with 27.3% of the deliveries ahead of Bombardier with 20.9% while Gulfstream would almost lead the revenue market share with 27.8% trailing Bombardier with 29.2%.[6] For 2016-2025, Jetcraft forecasted Pratt & Whitney Canada should be the first engine supplier with 30% of the $24B revenue, in front of the current leader Rolls-Royce at 25%. Honeywell will hold 45% of the avionics $16B revenue ahead of Rockwell Collins with 37% and Garmin.[10]