Inventories

Inventories consisted of the following:



	March 31 2017			December 31 2016
Long-term contracts in progress		$13,684			$12,801
Commercial aircraft programs	53,493			52,048
Commercial spare parts, used aircraft, general stock materials and other	5,410			5,446
Inventory before advances and progress billings	72,587			70,295
Less advances and progress billings	(29,340		)	(27,096		)
Total		$43,247			$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 $192 and $220) at March 31, 2017 and December 31, 2016. See indemnifications to ULA in Note 9.

Included in inventories are capitalized precontract costs of $728 and $729 primarily related to KC-46A Tanker and C-17 at March 31, 2017 and December 31, 2016.

Commercial Aircraft Programs

At March 31, 2017 and December 31, 2016, commercial aircraft programs inventory included the following amounts related to the 787 program: $32,374 and $32,501 of work in process (including deferred production costs of $26,992 and $27,308), $2,525 and $2,398 of supplier advances, and $3,581 and $3,625 of unamortized tooling and other non-recurring costs. At March 31, 2017, $23,606 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 $6,967 is expected to be recovered from units included in the program accounting quantity that represent expected future orders.

At March 31, 2017 and December 31, 2016, commercial aircraft programs inventory included $275 and $284 of unamortized tooling costs related to the 747 program. At March 31, 2017, $209 of unamortized tooling costs are expected to be recovered from units included in the program accounting quantity that have firm orders and $66 is expected to be recovered from units included in the program accounting quantity that represent expected future orders. At March 31, 2017 and December 31, 2016, work in process inventory included a number of completed 747 aircraft that we expect to recover from future orders.

Commercial aircraft programs inventory included amounts credited in cash or other consideration (early issue sales consideration) to airline customers totaling $3,139 and $3,117 at March 31, 2017 and December 31, 2016.