Inventories

Inventories consisted of the following:



	September 30 2017			December 31 2016
Long-term contracts in progress		$13,608			$12,801
Commercial aircraft programs	52,871			52,048
Commercial spare parts, used aircraft, general stock materials and other	6,068			5,446
Inventory before advances and progress billings	72,547			70,295
Less advances and progress billings	(29,516		)	(27,096		)
Total		$43,031			$43,199

Long-Term Contracts in Progress

Long-term contracts in progress includes Delta launch program inventory that is being sold at cost to United Launch Alliance (ULA) under an inventory supply agreement that terminates on March 31, 2021. The inventory balance was $120 (net of advances of $187 and $220) at September 30, 2017 and December 31, 2016. See indemnifications to ULA in Note 9.

Included in inventories are capitalized precontract costs of $847 and $729 primarily related to KC-46A Tanker and C-17 at September 30, 2017 and December 31, 2016.

Commercial Aircraft Programs

At September 30, 2017 and December 31, 2016, commercial aircraft programs inventory included the following amounts related to the 787 program: $31,664 and $32,501 of work in process (including deferred production costs of $25,948 and $27,308), $2,745 and $2,398 of supplier advances, and $3,334 and $3,625 of unamortized tooling and other non-recurring costs. At September 30, 2017, $22,584 of 787 deferred production costs, unamortized tooling and other non-recurring costs are expected to be recovered from units included in the program accounting quantity that have firm orders and $6,698 is expected to be recovered from units included in the program accounting quantity that represent expected future orders.

At September 30, 2017 and December 31, 2016, commercial aircraft programs inventory included $173 and $284 of unamortized tooling costs related to the 747 program. At September 30, 2017, $163 of unamortized tooling costs are expected to be recovered from units included in the program accounting quantity that have firm orders and $10 is expected to be recovered from units included in the program accounting quantity that represent expected future orders. At September 30, 2017, the program accounting quantity has 18 undelivered aircraft, including one already completed aircraft that has not been sold and is being remarketed.

Commercial aircraft programs inventory included amounts credited in cash or other consideration (early issue sales consideration) to airline customers totaling $2,951 and $3,117 at September 30, 2017 and December 31, 2016.