Mods: Please move if this isnt the correct forum.

I'm curious. When I check flight routs, ex: UA 50 EWR-FRA. Flightaware shows this:
MERIT HFD PUT EBONY N275A TUDEP NATU BEXET OSGAR BAKUR UN546 STU UL9 GAVGO UL18 INLAK UL607 SPI UT180 PESOV T180 RASVO T180 UNOKO

I know, it sounds "Greek" (no offense to people of Greek origin) to me, but can someone explain. Sometimes I see real "words" as well like:

HAPIE YAHOO BRADD N255A JOOPY NATZ SOMAX NATZ ATSUR RATKA UN502 JSY UY111 INGOR UM25 LUKIP

Yep, just a curious person.