Delta Air Lines revealed in its 10-K filing that its valuation allowance for deferred tax assets at the end of 2013 was $177 million, dramatically lower than the over $10 billion recorded at the end of 2012. Here is an excerpt from a press report from Bloomberg in January 2014, regarding this allowance:
Delta Air Lines Inc. (DAL) led shares of U.S. carriers higher after posting fourth-quarter profit that topped analysts' estimates and forecasting an operating margin of as much as 8 percent in this year's initial three months. . . . Airlines are benefiting from lower fuel prices, constraints on capacity growth, controls on operating costs and demand that's keeping planes full, said Ray Neidl of Nexa Capital Partners LLC, a Washington-based aerospace and transportation consulting firm. . . . Net income was $8.48 billion, including an $8 billion non-cash gain from the reversal of a tax valuation allowance.
Mary Schlangenstein, "Delta Leads Airline Stock Gains as Profit Beats Estimates," Bloomberg, January 21, 2014.
The following is an excerpt from a disclosure note to Delta's 2013 financial statements:

Required:
1. As indicated in the note, Delta had both deferred tax assets and deferred tax liabilities at the end of 2013. Some of each were current, some noncurrent. The balance sheet that year, though, reported only noncurrent deferred tax assets and current deferred tax assets. Explain why Delta's current deferred tax liabilities and noncurrent deferred tax liabilities were not explicitly reported. Explain what the current and noncurrent deferred tax assets represent.
2. What is a valuation allowance against deferred tax assets? When must such an allowance be recorded? Use Delta's situation to help illustrate your response.
3. Is an amount recorded in a valuation allowance for a deferred tax asset permanent? Explain why Delta is able to reclaim its valuation allowance.
4. Consider the excerpt from Bloomberg's press release. Recalculate the effect on Delta's 2013 net income of the change in Delta's valuation allowance for its deferred tax assets.

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NOTE 12. INCOME TAXES (In part) Deferred Taxes The components of deferred tax assets and liabilities at December 31 were as follows (in millions): December 31 2013 2012 Deferred tax assets: Net operating loss carryforwards Pension, postretirement and other benefits AMT credit carryforward Deferred revenue Other Valuation allowance $6,024S 6,414 6,415 402 2,133 881 4,982 378 1,965 698 (177) (10,963) Total deferred tax assets $13,870 $ 5,282 Deferred tax liabilities: Depreciation Intangible assets Other $4,7994,851 1,730 285 $ 7,142 S6,866 1,704 639 Total deferred tax liabilities