Questions & Answers about Paul vient en avion.
Because the subject is Paul, which is third person singular: he.
The verb venir (to come) changes depending on the subject:
- je viens = I come / I am coming
- tu viens = you come / you are coming
- il / elle / on vient = he / she / one comes
- nous venons = we come
- vous venez = you come
- ils / elles viennent = they come
So with Paul, you use vient.
Vient comes from the verb venir, which means to come.
This is an irregular verb, so its forms do not all follow the simplest pattern. In this sentence:
- venir = infinitive
- vient = present-tense form for il / elle / on
So Paul vient means Paul comes or Paul is coming, depending on context.