This is the 745th most frequent Russian word.
самолета
The word "самолета" is the genitive singular or accusative singular (inanimate) form of "самолёт," meaning "airplane" or "of the airplane" in English.
Here, 'самолет' is in its nominative form, used as the subject of the clause, denoting the plane as the main agent performing the action of landing.
Я видел, как самолет сел на поле.
I saw the plane land on the field.
Here, 'самолет' is in the genitive form (самолета), used to show possession or source, indicating that the phone was inside or related to the plane.
Он взял свой телефон из самолета.
He took his phone from the plane.
The word 'самолет' is also in the genitive form (самолета), used here in combination with the noun 'прибытие' (arrival) to indicate the object associated with the arrival.