We utilize certain aircraft, land, facilities, retail locations and equipment under capital and operating leases that expire at various dates through 2051. We leased 6% of our total aircraft fleet under operating leases as of May 31, 2019 and 7% as of May 31, 2018. A portion of our supplemental aircraft are leased by us under agreements that provide for cancellation upon 30 days’ notice. Our leased facilities include national, regional and metropolitan sorting facilities, retail facilities and administrative buildings.

Rent expense under operating leases for the years ended May 31 was as follows (in millions):

	2019		2018		2017
Minimum rentals	$	2,875	$	2,913	$	2,814
Contingent rentals⁽¹⁾		222		194		178
	$	3,097	$	3,107	$	2,992

A summary of future minimum lease payments under noncancelable operating leases with an initial or remaining term in excess of one year at May 31, 2019 is as follows (in millions):

	Operating Leases
	Aircraft and Related Equipment		Facilities and Other		Total Operating Leases
2020	$	288	$	2,209	$	2,497
2021		230		2,033		2,263
2022		212		1,816		2,028
2023		154		1,625		1,779
2024		58		1,428		1,486
Thereafter		85		7,977		8,062
Total	$	1,027	$	17,088	$	18,115

Property and equipment recorded under capital leases and future minimum lease payments under capital leases are immaterial. The weighted-average remaining lease term of all operating leases outstanding at May 31, 2019 was approximately six years. While certain of our lease agreements contain covenants governing the use of the leased assets or require us to maintain certain levels of insurance, none of our lease agreements include material financial covenants or limitations.

FedEx Express makes payments under certain leveraged operating leases that are sufficient to pay principal and interest on certain pass-through certificates. The pass-through certificates are not direct obligations of, or guaranteed by, FedEx or FedEx Express.

We are the lessee under certain operating leases covering a portion of our leased aircraft in which the lessors are trusts established specifically to purchase, finance and lease these aircraft to us. These leasing entities are variable interest entities. We are not the primary beneficiary of the leasing entities, as the lease terms are at market at the inception of the lease and do not include a residual value guarantee, fixed-price purchase option or similar feature that obligates us to absorb decreases in value or entitles us to participate in increases in the value of the aircraft. Therefore, we are not required to consolidate any of these entities as the primary beneficiary. Our maximum exposure under these leases is included in the summary of future minimum lease payments.