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Commitments and Contingencies (Details 3) (USD $) | 12 Months Ended |  |  |  |  |  | 12 Months Ended
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Dec. 31, 2012 item | Dec. 31, 2011 | Dec. 31, 2012 Total revenues Significant Customers Delta, United, and Continental Combined | Dec. 31, 2011 Total revenues Significant Customers Delta, United, and Continental Combined | Dec. 31, 2010 Total revenues Significant Customers Delta, United, and Continental Combined | Dec. 31, 2012 Full-time equivalent employees Employees represented by unions | Dec. 31, 2012 Full-time equivalent employees Employees represented by unions Atlantic Southeast Pilots item | Dec. 31, 2012 Full-time equivalent employees Employees represented by unions Atlantic Southeast Flight Attendants item | Dec. 31, 2012 Full-time equivalent employees Employees represented by unions Atlantic Southeast Flight Controllers item | Dec. 31, 2012 Full-time equivalent employees Employees represented by unions Atlantic Southeast Mechanics item | Dec. 31, 2012 Full-time equivalent employees Employees represented by unions Atlantic Southeast Stock Clerks item | Dec. 31, 2012 Full-time equivalent employees Employees represented by unions ExpressJet Delaware Pilots item | Dec. 31, 2012 Full-time equivalent employees Employees represented by unions ExpressJet Delaware Flight Attendants item | Dec. 31, 2012 Full-time equivalent employees Employees represented by unions ExpressJet Delaware Mechanics item | Dec. 31, 2012 Full-time equivalent employees Employees represented by unions ExpressJet Delaware Dispatchers item | Dec. 31, 2012 Full-time equivalent employees Employees represented by unions ExpressJet Delaware Stock Clerks item
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ 94,000 | $ 240,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk and Significant Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  | 94.80% | 97.60% | 94.70% | 42.00% |  |  |  |  |  |  |  |  |  |
Number of full-time equivalent employees | 18,145 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approximate Number of Active Employees |  |  |  |  |  |  | 1,620 | 940 | 70 | 420 | 70 | 2,560 | 1,200 | 670 | 80 | 75

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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