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Commitments and Contingencies (Details 2) | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) employee | Dec. 31, 2014 USD ($) | Dec. 31, 2013
Concentration Risk and Significant Customers |  |  |
Allowance for doubtful accounts | $ | $ 187,300 | $ 326,600 |
Number of full-time equivalent employees | 18,300 |  |
Revenue from Rights Concentration Risk | Customer Concentration Risk | Delta, United, and Continental Combined |  |  |
Concentration Risk and Significant Customers |  |  |
Concentration risk (as a percent) | 86.90% | 88.70% | 91.60%
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk |  |  |
Concentration Risk and Significant Customers |  |  |
Concentration risk (as a percent) | 38.00% |  |
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk | Atlantic Southeast Pilots |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate Number of Active Employees | 1,491 |  |
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk | Atlantic Southeast Flight Attendants |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate Number of Active Employees | 1,031 |  |
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk | Atlantic Southeast Flight Controllers |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate Number of Active Employees | 36 |  |
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk | Atlantic Southeast Mechanics |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate Number of Active Employees | 364 |  |
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk | Atlantic Southeast Stock Clerks |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate Number of Active Employees | 73 |  |
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk | ExpressJet Delaware Pilots |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate Number of Active Employees | 2,107 |  |
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk | ExpressJet Delaware Flight Attendants |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate Number of Active Employees | 993 |  |
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk | ExpressJet Delaware Mechanics |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate Number of Active Employees | 711 |  |
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk | ExpressJet Delaware Dispatchers |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate Number of Active Employees | 53 |  |
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk | ExpressJet Delaware Stock Clerks |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate Number of Active Employees | 96 |  |

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