Improve the Seating Class of a Plane Passenger

This page is the CodyCross answer for the clue below from Nordic Wonders, Group 1953, Puzzle 4 (Puffins and Seals).

Question is: Improve the Seating Class of a Plane Passenger

and the answer is: UPGRADE

Word Meaning:

UPGRADE — An upward grade or slope.

Definitions from Wiktionary.