| No TPTP formula. May not be expressible in strict first order. | Transportation.kif 2582-2582 | Airplane is a subclass of aircraft |
| No TPTP formula. May not be expressible in strict first order. | Transportation.kif 2583-2583 | Airplane is a subclass of powered vehicle |
| No TPTP formula. May not be expressible in strict first order. | Transportation.kif 2589-2589 | Propeller plane is a subclass of airplane |
| No TPTP formula. May not be expressible in strict first order. | Transportation.kif 2590-2590 | Jet airplane is a subclass of airplane |
| No TPTP formula. May not be expressible in strict first order. | Transportation.kif 2591-2591 | Propeller jet is a subclass of airplane |
| No TPTP formula. May not be expressible in strict first order. | MilitaryDevices.kif 1708-1708 | VSTOL is a subclass of airplane |
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