Inventories

Inventories at December 31 consisted of the following:



	2014			2013
Long-term contracts in progress		$13,381			$12,608
Commercial aircraft programs	55,220			48,065
Commercial spare parts, used aircraft, general stock materials and other	7,421			7,793
Inventory before advances and progress billings	76,022			68,466
Less advances and progress billings	(29,266		)	(25,554		)
Total		$46,756			$42,912

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, 2014 and 2013, the inventory balance was $154 (net of advances of $322) and $425 (net of advances of $331). At December 31, 2014, $292 of this inventory related to unsold launches. See Note 12.

Capitalized precontract costs of $1,281 and $520 at December 31, 2014 and 2013 are included in inventories. See C-17 in Note 11.

Commercial Aircraft Programs

At December 31, 2014 and 2013, commercial aircraft programs inventory included the following amounts related to the 787 program: $33,163 and $27,576 of work in process (including deferred production costs of $26,149 and $21,620), $2,257 and $2,189 of supplier advances, and $3,801 and $3,377 of unamortized tooling and other non-recurring costs. At December 31, 2014, $20,982 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 $8,968 is expected to be recovered from units included in the program accounting quantity that represent expected future orders.

At December 31, 2014 and 2013, commercial aircraft programs inventory included the following amounts related to the 747 program: $1,741 and $1,554 of deferred production costs, net of previously recorded reach-forward losses, and $476 and $563 of unamortized tooling costs. At December 31, 2014, $1,047 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 $1,170 is expected to be recovered from units included in the program accounting quantity that represent expected future orders.

Commercial aircraft programs inventory included amounts credited in cash or other consideration (early issue sales consideration) to airline customers totaling $3,341 and $3,465 at December 31, 2014 and 2013.