Italian Phrase
L'ho compilato sull'aereo.
Meaning
Literally, “I have filled it out on the plane.” It refers to completing a form, questionnaire, or similar document while you were aboard an aircraft.
When to use
Use this sentence when you want to tell someone that you finished a paperwork task during a flight, for example after landing and handing over a customs form or a travel questionnaire.
✦Grammar Breakdown
L'hocompilatosull'aereo
Clitic pronoun before auxiliary
When a direct‑object pronoun (lo/la) is used with the auxiliary 'avere', it attaches to the verb and appears before the auxiliary (e.g., L'ho).
Passato prossimo agreement
With 'avere' the past participle normally does not agree with the object; however, if the pronoun precedes the auxiliary, agreement is required (e.g., L'ho vista). In this sentence the object is masculine singular, so no extra -a/-e is added.
Contraction su + il = sul
The preposition 'su' (on) contracts with the masculine singular article 'il' to form 'sul'.
Compilare = to fill out (a form)
In Italian 'compilare' is used for completing paperwork, not for filling a container.
🗨In Conversation
Hai finito il modulo per l'immigrazione?
Did you finish the immigration form?
Sì, l'ho compilato sull'aereo.
Yes, I filled it out on the plane.
✕Common Mistakes
L'ho compilato in aereo.
The correct preposition for 'on the plane' is 'su' (contracted to 'sul'), not 'in'.
L'ho compilata sull'aereo.
Because the direct object pronoun precedes the auxiliary, the past participle must agree with the gender/number of the pronoun. Here the object is masculine, so 'compilato' is correct.
Ho compilato l' sull'aereo.
In Italian the pronoun must be placed before the auxiliary, not after it.
↔Alternatives
L'ho riempito sull'aereo.
I filled it on the plane.
L'ho completato a bordo dell'aereo.
I completed it aboard the plane.
L'ho compilato durante il volo.
I filled it out during the flight.
Cultural Tip
Italian airlines often hand out customs or health declaration forms that passengers fill out while in the air. While 'sull'aereo' is perfectly correct, many Italians prefer the slightly more formal 'a bordo dell'aereo' or the temporal phrase 'durante il volo'. Remember that 'compilare' is only used for paperwork, not for filling a cup or a bag.