As of December 31, 2021, we leased 17 aircraft, airport facilities, office space, and other property and equipment under non-cancelable operating leases. The leases generally require us to pay all taxes, maintenance, insurance, and other operating expenses. Rental expense is recognized on a straight-line basis over the lease term, net of lessor rebates and other incentives. We expect that, in the normal course of business, such operating leases that expire will be renewed or replaced by other leases, or the property may be purchased rather than leased. Aggregate rental expense under all aircraft, equipment and facility operating leases totaled approximately $11.2 million and $11.4 million for the three months ended December 31, 2021 and 2020, respectively.

	Three Months Ended December 31,
	2021		2020

Operating lease costs	$	9,480	$	9,708
Variable and short-term lease costs		1,735		1,689
Total lease costs	$	11,215	$	11,397

As of December 31, 2021, our operating lease right-of-use assets were $88.5 million, our current maturities of operating lease liabilities were $26.9 million, and our noncurrent operating lease liabilities were $34.4 million.

Our operating lease payments in operating cash flows for the three months ended December 31, 2021 and 2020 were $10.2 million and $9.3 million, respectively.

As of December 31, 2021, our operating leases have a remaining weighted average lease term of 3.7 years and our operating lease liabilities were measured using a weighted average discount rate of 4.4%.

As of December 31, 2021, we have $3.0 million of additional operating lease commitments commencing in future periods.