Input: Identify the most salient words:

An airplane stopped on the runway to unload passengers.

Output: airplane
passenger
unload

Input: Identify the most salient words:

flying fighter aircraft in formation which was the standard formation used on operational missions

Output: aircraft
fly
mission

Input: Identify the most salient words:

add a pop of color with flowers

Output: add
color
flower
pop

Input: Identify the most salient words:

a waiter carrying a tray of champagne

Output:
carry
tray
waiter