In a Word

https://commons.wikimedia.org/wiki/File:U.S._Air_Force_fire_trucks_spray_water_over_a_KC-135_Stratotanker_aircraft_during_the_final_flight,_or_fini_flight,_for_Col._Corey_Martin,_the_commander_of_the_376th_Air_Expeditionary_Wing,_at_Transit_Center_130604-F-LK329-001.jpg

oss
v. to signify, indicate, or make known to somebody that something is the case

mensk
n. honor, dignity, reverence

eximious
adj. distinguished, eminent, excellent

serein
n. a fine rain falling from a cloudless sky

Momentous flights are sometimes marked by a “water salute” in which an aircraft passes under plumes of water sprayed by firefighting vehicles.

Here U.S. Air Force fire trucks salute a KC-135 Stratotanker, marking the final flight of Col. Corey Martin, commander of the 376th Air Expeditionary Wing, in Kyrgyzstan in 2013.