At September 30, 2022, the Company leased 16 aircraft, airport facilities, office space, and other property and equipment under non-cancelable operating leases. The operating leases require the Company to pay 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. The Company expects 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 operating aircraft, equipment and facility leases totaled approximately $43.4 million, $44.6 million, and $51.4 million for the year ended September 30, 2022, 2021, and 2020, respectively.

At September 30, 2022, the Company leased 2 aircraft and 3 spare engines under non-cancelable finance leases. Basic rent on finance leases is paid monthly and at the end of the lease term. At the end of the lease term, the Company has the option to purchase the aircraft and engines for most of the finance leases. These finance leases are reflected as finance lease obligations of $18.0 million on our consolidated balance sheet as of September 30, 2022.

The components of our operating and finance lease costs were as follows (in thousands):

	Year Ended September 30,
	2022		2021
Operating lease costs	$	37,637	$	37,929
Variable and short-term lease costs		5,783		6,708
Interest expense on finance lease liabilities		547		576
Amortization expense of finance lease assets		2,705		2,130
Total lease costs	$	46,672	$	47,343

As of September 30, 2022, the Company’s operating lease right-of-use assets were $43.1 million, the Company’s current maturities of operating lease liabilities were $17.2 million, and the Company’s noncurrent operating lease liabilities were $16.7 million. As of September 30, 2022, the Company’s current portion of finance lease liabilities were $2.7 million, and the Company’s noncurrent finance lease liabilities were $15.3 million.

The Company’s operating lease payments included in operating cash flows for the year ended September 30, 2022 and 2021 were $36.3 million and $47.6 million, respectively. The Company’s finance lease interest payments included in operating cash flows for the year ended September 30, 2022 and 2021 were $0.3 million and $0.6 million, respectively. The Company’s finance lease principal payments included in financing cash flows for the year ended September 30, 2022 and 2021 were $2.5 million and $2.3 million, respectively.

Due to the impacts of the pilot shortage and the pilot wage increase, we evaluated all asset groups during the quarter ended September 30, 2022 and determined that only the asset group associated with the CRJ-900 fleet operating under the American CPA, discussed in Note 8, required impairment. This resulted in an impairment loss of $15.2 million to the leased aircraft within the asset group for the CRJ-900 fleet operating for the year ended September 30, 2022, which was recorded in asset impairment on our consolidated statements of operations and comprehensive (loss) income. Additionally, we recorded a $0.2 million of impairment on certain operating lease ROU assets associated with the abandonment of a leased facility during the year ended September 30, 2022. The Company did not record any impairment losses related to its operating lease right-of-use assets during the years ended September 30, 2021 and 2020.

The table below presents the weighted average remaining terms and discount rates for our operating and finance leases as of September 30, 2022:

As of September 30, 2022
Finance leases:
Weighted average remaining lease term	7.4 years
Weighted average discount rate		6.1	%
Operating leases:
Weighted average remaining lease term	3.8 years
Weighted average discount rate		4.5	%

The following table summarizes future minimum rental payments, primarily related to leased aircraft, required under operating and finance leases that had initial or remaining non-cancelable lease terms as of September 30, 2022 (in thousands):

Periods Ending September 30,	Operating Leases			Finance Leases
2023	$	18,356		$	2,730
2024		10,172			7,054
2025		1,564			1,800
2026		1,046			1,800
2027		1,029			1,800
Thereafter		5,054			6,600
Total lease payments		37,221			21,784
Less: imputed interest		(3,256	)		(3,746	)
Amounts recorded in the consolidated balance sheet	$	33,965		$	18,038

RASPRO Lease Facility. On September 23, 2005, Mesa Airlines, as lessee, entered into the RASPRO Lease Facility, with RASPRO as lessor, for 15 of our CRJ-900 aircraft. The obligations under the RASPRO Lease Facility are guaranteed by us, and basic rent is paid quarterly on each aircraft. On each of March 10, 2014, June 5, 2014, and December 8, 2017, the RASPRO Lease Facility was amended to defer certain payments of basic rent (the "Deferred Amounts"). Until the principal of and accrued interest on the Deferred Amounts are paid in full: (i) we and Mesa Airlines are prohibited from paying any dividends to holders of our common stock, (ii) we are prohibited from repurchasing any of our warrants or other equity interests, (iii) Mesa Airlines must maintain a minimum of $35.0 million of cash, cash equivalents and availability under lines of credit, (iv) Mesa Airlines must provide RASPRO with periodic monthly, quarterly and annual reports containing certain financial information and forecasted engine repair costs and (v) we must maintain a minimum debt-to-assets ratio.

In June 2020, the Company amended its RASPRO aircraft lease agreement to defer a $4.0 million lease payment otherwise due in June 2020. Per the amended agreement dated June 5, 2020, the Company is required to pay this amount over the period of September 2021 through March 2024. The Company made the accounting election available for COVID-19 related concessions provided by a lessor and accordingly, this was not a lease modification and required no changes to current accounting treatment. As of September 30, 2022, we were in compliance with the covenants in the RASPRO Lease Facility.