Questions & Answers about Nous voyageons en avion.
Because voyageons is the conjugated form of the verb voyager in the present tense for nous (we).
- voyager = the infinitive, to travel
- nous voyageons = we travel / we are traveling
For regular -er verbs, the nous form in the present usually ends in -ons:
- nous parlons = we speak
- nous regardons = we watch
- nous voyageons = we travel
That extra e is there to keep the g sound soft.
In French:
- g before a, o, u usually sounds hard, like in go
- g before e, i usually sounds soft, like the s in measure
Without the extra e, voyagons would suggest a hard g sound, which is wrong. So French writes voyageons to keep the soft sound.
The same thing happens in other verbs:
- manger → nous mangeons
- nager → nous nageons