Inventories

Inventories at December 31 consisted of the following:



	2012			2011
Long-term contracts in progress		$15,130			$13,587
Commercial aircraft programs	40,389			35,080
Commercial spare parts, used aircraft, general stock materials and other	7,206			7,832
Inventory before advances and progress billings	62,725			56,499
Less advances and progress billings	(24,974		)	(24,259		)
Total		$37,751			$32,240

Long-Term Contracts in Progress

Long-term contracts in progress included 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, 2012 and 2011, the inventory balance, net of advances, was $725 and $1,085. At December 31, 2012, $534 of this inventory related to unsold launches. ULA is continuing to assess the future of the Delta II program. In the event ULA is unable to sell additional Delta II inventory, our earnings could be reduced by up to $35. See Note 13.

Inventory balances included $237 and $236 subject to claims or other uncertainties relating to the A-12 program at December 31, 2012 and 2011. See Note 21.

Capitalized precontract costs of $238 and $1,728 at December 31, 2012 and 2011, are included in inventories.

Commercial Aircraft Programs

At December 31, 2012 and 2011, commercial aircraft programs inventory included the following amounts related to the 787 program: $21,289 and $16,098 of work in process (including deferred production costs at December 31, 2012 of $15,929 and $10,753), $1,908 and $1,770 of supplier advances, and $2,339 and $1,914 of unamortized tooling and other non-recurring costs. At December 31, 2012, $12,810 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 $5,458 is expected to be recovered from units included in the program accounting quantity that represent expected future orders.

At December 31, 2012 and 2011, commercial aircraft programs inventory included the following amounts related to the 747 program: $1,292 and $448 of deferred production costs, net of previously recorded reach-forward losses, and $683 and $852 of unamortized tooling costs. At December 31, 2012, $1,048 of 747 deferred production costs and unamortized tooling are expected to be recovered from units included in the program accounting quantity that have firm orders and $927 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 $2,989 and $2,564 at December 31, 2012 and 2011.