Minimum future annual lease rentals contracted to be received under our existing operating leases of flight equipment at February 29, 2020 were as follows:


Year Ending February 29/28,	Amount
Remainder of 2020	$	626,752
2021	691,344
2022	603,410
2023	524,674
2024	417,348
Thereafter	563,288
Total	$	3,426,816

Geographic concentration of lease rental revenue earned from flight equipment held for lease was as follows:


	Two Months Ended February 29/28,
Region		2020		2019
Asia and Pacific		43	%	42	%
Europe		26	%	27	%
Middle East and Africa		7	%	11	%
North America		11	%	8	%
South America		13	%	12	%

Total		100	%	100	%

The classification of regions in the table above and in the tables and discussion below is determined based on the principal location of the lessee of each aircraft.

The following table shows the number of lessees with lease rental revenue of at least 5% of total lease rental revenue and their combined total percentage of lease rental revenue for the periods indicated:


	Two Months Ended February 29/28,
		2020	2019
			Number of Lessees	Combined % of Lease Rental Revenue	Number of Lessees	Combined % of Lease Rental Revenue
Largest lessees by lease rental revenue			3	21%	4	26%

The following table sets forth revenue attributable to individual countries representing at least 10% of Total revenue (including maintenance revenue) based on each lessee’s principal place of business for the periods indicated:


	Two Months Ended February 29/28,
		2020	2019
Country			Revenue		% of Total Revenue		Revenue		% of Total Revenue
Indonesia(1)			$	25,373	13	%	$	—	—	%
South Africa(2)			50,781		26	%	—		—	%

(1)For the two months ended February 29, 2020, total revenue attributable to Indonesia included $14,987 of gain on sale of flight equipment. For the two months ended February 28, 2019, total revenue attributable to Indonesia was less than 10%.

(2)For the two months ended February 29, 2020, total revenue attributable to South Africa included $38,305 of maintenance revenue and $9,062 of security deposits recognized into revenue. For the two months ended February 28, 2019, total revenue attributable to South Africa was less than 10%.

Geographic concentration of net book value of flight equipment (including flight equipment held for lease and net investment in leases, or “net book value”) as of the dates indicated below was as follows:


	February 29, 2020				December 31, 2019
Region	Number of Aircraft		Net Book Value %		Number of Aircraft		Net Book Value %
Asia and Pacific	90		38	%	94		38	%
Europe	99		27	%	99		26	%
Middle East and Africa	15		6	%	16		7	%
North America	40		13	%	40		13	%
South America	26		15	%	26		15	%
Off-lease	2	(1)	1	%	3	(2)	1	%
Total	272		100	%	278		100	%

(1)Consisted of one Airbus A330-200 aircraft, which was delivered to a customer in Europe in August 2020, and one Boeing 737-800 aircraft, which we are marketing for lease or sale.

(2)Consisted of one Airbus A320-200 aircraft, which was delivered on lease to a customer in Europe in February 2020, one Airbus A330-200 aircraft, was delivered to a customer in Europe in August 2020, and one Boeing 737-800 aircraft, which was sold in February 2020.

The following table sets forth net book value of flight equipment (includes net book value of flight equipment held for lease and net investment in leases) attributable to individual countries representing at least 10% of net book value of flight equipment based on each lessee’s principal place of business as of:


	February 29, 2020				December 31, 2019
Country	Net Book Value		Net Book Value %	Number of Lessees	Net Book Value		Net Book Value %	Number of Lessees
India	$	917,793	12%	4	$	924,190	12%	4

At February 29, 2020 and December 31, 2019, the amounts of lease incentive liabilities recorded in maintenance payments on our Consolidated Balance Sheets were $10,076 and $9,176, respectively.