Just a small technical correction...
Airplanes, like new cars, are either owned or leased but not both. If you lease a car, at the end of the lease you turn it over to the dealer because you never owned it. A leased airplane is turned over to the lessor at the end of the lease - the lessor owns the airplane. If you buy a car, using borrowed money with the car being collateral for the loan, you pay the loan off and own the car. An airplane, likewise, can be the collateral for a loan that provides the money to buy the plane. When the loan is paid off, the airplane is owned by the airline.
The only real difference is the cost of the asset (car or plane) and the useful life. While you may lease a car for 36 months, a lease on a new plane is 10 years or longer. Same with borrowing to buy a new plane - a car may be a 36-60 month loan while a new plane entails a loan for 10 or more years.
Jim