Inventories

Inventories consisted of the following:



	March 31 2013			December 31 2012
Long-term contracts in progress		$15,246			$15,130
Commercial aircraft programs	44,340			40,389
Commercial spare parts, used aircraft, general stock materials and other	7,042			7,206
Inventory before advances and progress billings	66,628			62,725
Less advances and progress billings	(25,831		)	(24,974		)
Total		$40,797			$37,751

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 March 31, 2013 and December 31, 2012, the inventory balance, net of advances, was $725. At March 31, 2013, $440 of this inventory related to unsold launches. See Note 10.

Inventory balances included $237 subject to claims or other uncertainties relating to the A-12 program at March 31, 2013 and December 31, 2012. See Note 16.

Capitalized precontract costs of $261 and $238 at March 31, 2013 and December 31, 2012, are included in inventories.

Commercial Aircraft Programs

At March 31, 2013 and December 31, 2012, commercial aircraft programs inventory included the following amounts related to the 787 program: $24,358 and $21,289 of work in process (including deferred production costs of $17,095 and $15,929), $1,947 and $1,908 of supplier advances, and $2,508 and $2,339 of unamortized tooling and other non-recurring costs. At March 31, 2013, $14,525 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 $5,078 is expected to be recovered from units included in the program accounting quantity that represent expected future orders.

At March 31, 2013 and December 31, 2012, commercial aircraft programs inventory included the following amounts related to the 747 program: $1,312 and $1,292 of deferred production costs, net of previously recorded reach-forward losses, and $653 and $683 of unamortized tooling costs. At March 31, 2013, $1,046 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 $919 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 $3,083 and $2,989 at March 31, 2013 and December 31, 2012.