Lease Rental Revenues and Flight Equipment Held for Lease

Minimum future annual lease rentals contracted to be received under our existing operating leases of flight equipment at June 30, 2017 were as follows:



Year Ending December 31,	Amount
Remainder of 2017	$	342,919
2018	661,174
2019	561,621
2020	455,370
2021	374,490
Thereafter	822,861
Total	$	3,218,435

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



	Three Months Ended June 30,				Six Months Ended June 30,
Region	2017		2016		2017		2016
Asia and Pacific	37	%	39	%	39	%	40	%
Europe	24	%	24	%	23	%	25	%
Middle East and Africa	12	%	12	%	12	%	11	%
North America	8	%	6	%	7	%	5	%
South America	19	%	19	%	19	%	19	%
Total	100	%	100	%	100	%	100	%

The classification of regions in the tables above and in the table 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% and their combined total percentage of lease rental revenue for the years indicated:



	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	Number of Lessees	Combined % of Lease Rental Revenue	Number of Lessees	Combined % of Lease Rental Revenue	Number of Lessees	Combined % of Lease Rental Revenue	Number of Lessees	Combined % of Lease Rental Revenue
Largest lessees by lease rental revenue	3	19%	4	25%	3	19%	4	25%

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Country	Revenue		% of Total Revenue	Revenue		% of Total Revenue	Revenue		% of Total Revenue	Revenue		% of Total Revenue
Indonesia⁽¹⁾	$	—	—%	$	19,906	11%	$	—	—%	$	39,450	11%
Singapore⁽²⁾	24,082		11%	—		—%	—		—%	—		—%

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(1)	Total revenue attributable to Indonesia was less than 10% for the three and six months ended June 30, 2017.


(2)	Total revenue attributable to Singapore included $20,542 of maintenance revenue for the three months ended June 30, 2017, and was less than 10% for the six months ended June 30, 2017 and for the three and six months ended June 30, 2016.

Geographic concentration of net book value of flight equipment (including flight equipment held for lease and net investment in finance and sales-type leases, or "net book value") was as follows:



	June 30, 2017			December 31, 2016
Region	Number of Aircraft	Net Book Value %		Number of Aircraft		Net Book Value %
Asia and Pacific	56	36	%	61		38	%
Europe	69	27	%	66		23	%
Middle East and Africa	14	10	%	14		11	%
North America	28	8	%	26		8	%
South America	23	19	%	23		18	%
Off-lease	—	—	%	3	⁽¹⁾	2	%
Total	190	100	%	193		100	%

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(1)	Consisted of one Airbus A330-200 aircraft, which was delivered on lease to a customer in February 2017, and two Airbus A321-200 aircraft, which were both delivered on lease to a customer during the second quarter of 2017.

At June 30, 2017 and December 31, 2016, no country represented at least 10% of net book value of flight equipment based on each lessee’s principal place of business.

At June 30, 2017 and December 31, 2016, the amounts of lease incentive liabilities recorded in maintenance payments on our Consolidated Balance Sheets were $14,601 and $14,931, respectively.