Inventories

Inventories at December 31 consisted of the following:



	2015			2014
Long-term contracts in progress		$13,858			$13,381
Commercial aircraft programs	55,230			55,220
Commercial spare parts, used aircraft, general stock materials and other	6,673			7,421
Inventory before advances and progress billings	75,761			76,022
Less advances and progress billings	(28,504		)	(29,266		)
Total		$47,257			$46,756

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. At December 31, 2015 and 2014, the inventory balance was $120 (net of advances of $310) and $154 (net of advances of $322). At December 31, 2015, $176 of this inventory related to unsold launches. See Note 12.

Included in inventories are capitalized precontract costs of $732 at December 31, 2015, primarily related to KC-46A Tanker and $1,281 at December 31, 2014, primarily related to C-17. See Note 11.

Commercial Aircraft Programs

At December 31, 2015 and 2014, commercial aircraft programs inventory included the following amounts related to the 787 program: $34,656 and $33,163 of work in process (including deferred production costs of $28,510 and $26,149), $2,551 and $2,257 of supplier advances, and $3,890 and $3,801 of unamortized tooling and other non-recurring costs. At December 31, 2015, $23,721 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 $8,679 is expected to be recovered from units included in the program accounting quantity that represent expected future orders.

At December 31, 2015 and 2014, commercial aircraft programs inventory included the following amounts related to the 747 program: $942 and $1,741 of deferred production costs, net of reach-forward losses, and $377 and $476 of unamortized tooling costs. At December 31, 2015, $342 of 747 deferred production and unamortized tooling costs are expected to be recovered from units included in the program accounting quantity that have firm orders and $977 is expected to be recovered from units included in the program accounting quantity that represent expected future orders. At December 31, 2015 we have a number of completed 747 aircraft in work in process inventory 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 $3,166 and $3,341 at December 31, 2015 and 2014.

Used aircraft in inventories at Commercial Airplanes totaled $267 and $275 at December 31, 2015 and 2014.