As of December 31, 2019, all of the Company's Rental of flight equipment revenues were generated by leasing flight equipment to foreign and domestic airlines, and the Company leased and managed aircraft to 106 customers whose principal places of business are located in 59 countries as of December 31, 2019 compared to 94 lessees in 56 countries as of December 31, 2018.

Over 95% of our aircraft are operated internationally. The following table sets forth the regional concentration based on each airline's principal place of business of our flight equipment subject to operating leases based on net book value as of December 31, 2019 and 2018:

(1)	As of December 31, 2018, we had six aircraft held for sale with a carrying value of $241.6 million included in the table above.

At December 31, 2019 and 2018, we owned and managed leased aircraft to customers in the following regions based on each airline's principal place of business:


	December 31, 2019			December 31, 2018
	Number of			Number of
Region	Customers⁽¹⁾	% of Total		Customers⁽¹⁾	% of Total
Europe	43	40.6	%	33	35.1	%
Asia (excluding China)	19	17.9	%	18	19.1	%
The Middle East and Africa	13	12.3	%	11	11.8	%
U.S. and Canada	10	9.4	%	10	10.6	%
Central America, South America, and Mexico	9	8.5	%	10	10.6	%
China	9	8.5	%	9	9.6	%
Pacific, Australia, and New Zealand	3	2.8	%	3	3.2	%
Total	106	100.0	%	94	100.0	%

(1)	A customer is an airline with its own operating certificate.

The following table sets forth the dollar amount and percentage of our Rental of flight equipment revenues from our flight equipment subject to operating leases attributable to the indicated regions based on each airline’s principal place of business:


	Year Ended				Year Ended				Year Ended
	December 31, 2019				December 31, 2018				December 31, 2017
	Amount of				Amount of				Amount of
	Rental				Rental				Rental
Region	Revenue		% of Total		Revenue		% of Total		Revenue		% of Total
		(in thousands, except percentages)
Europe	$	531,778	27.7	%	$	476,515	29.2	%	$	450,628	31.1	%
Asia (excluding China)		484,017	25.3	%		412,465	25.3	%		332,284	22.9	%
China		357,278	18.6	%		329,977	20.2	%		324,147	22.3	%
The Middle East and Africa		226,932	11.8	%		179,497	11.0	%		116,799	8.1	%
Central America, South America, and Mexico		124,850	6.6	%		108,736	6.7	%		102,205	7.0	%
U.S. and Canada		98,627	5.1	%		77,678	4.8	%		76,685	5.3	%
Pacific, Australia, and New Zealand		93,387	4.9	%		46,332	2.8	%		47,987	3.3	%
Total	$	1,916,869	100.0	%	$	1,631,200	100.0	%	$	1,450,735	100.0	%

Based on our lease placements of future new aircraft deliveries, we anticipate that a majority of our aircraft will be located in the Europe and Asia regions.

For the years ended December 31, 2019, 2018, and 2017, China was the only individual country that represented at least 10% of our rental revenue based on each airline's principal place of business. In 2019, 2018, and 2017, no individual airline represented at least 10% of our rental revenue.

Currency risk

The Company attempts to minimize currency and exchange risks by entering into aircraft purchase agreements and a majority of lease agreements and debt agreements with U.S. dollars as the designated payment currency.