| Subject | French | English |
| transp., avia., mech.eng. | train d'atterrissage rétractable | retractable undercarriage |
| transp., avia., mech.eng. | train d'atterrissage rétractable | retractable landing gear |
| transp., avia., mech.eng. | train rétractable | retractable undercarriage |
| transp., avia., mech.eng. | train rétractable | retractable landing gear |
| transp., avia., mech.eng. | train semi-rétractable | semi-retractable undercarriage |
| transp., avia., mech.eng. | train semi-rétractable | semi-retractable landing gear |
| transp., avia., mech.eng. | train semi-rétractable | kneeling-type undercarriage |
| transp., avia., mech.eng. | train semi-rétractable | kneel-type landing gear |