cm:Concept: us-gaap:AirTrafficLiabilityCurrent
| Air Traffic Liability, Current |
| us-gaap:AirTrafficLiabilityCurrent |
| The value of air transportation services sold but as yet unused by the passenger, including sales for air transportation to be provided by the reporting air carrier and air transportation to be provided by another air carrier for whom sales were made. Used to reflect the current portion of the liability (within one year or within the normal operating cycle if longer). |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:AirTrafficLiabilityCurrent |