American military aircraft always have a letter in their designation to show what kind of plane it is. And it has been that way since the beginning of military air power in the USA.
This is a Douglas F-15 and a North American P-51 Mustang in formation flight.
With those two planes, the F of F-15 stands for "Fighter" and the P of P-51 stands for "Pursuit"
This is a Boeing B-52, B standing for "Bomber"
This is a Lockheed C-130 Hercules, C standing for "Cargo"
So when the NATO came to be the decision was made to give Soviet aircraft nicknames starting with the letters used in the American designation system, so it would be easy to classify what aircraft a certain make is.
All the Russian Fighter planes have NATO names starting with an F
This is a Sukhoi Su-27 "Flanker" the nickname beginning with an F which shows it to be a fighter.
This is a Tupolev Tu-142 "Bear", the nickname with a B designating it a Bomber.
Now those people who gave those nicknames to those planes were sometimes kinda biased and as such, some Russian planes got very unflattering Nicknames and none more so than their Cargo planes.
And I figured it to be fun to showcase those nicknames, some bordering on sheer stupidity.
This is an Illyushin Il-14 "Crate"
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The Antonov An-2 "Colt"
The Illyushin Il-18 "Clam"
The Tupolev 104 "Camel"
The Antonov An-8 "Camp"
The Tupolev 124 "Cookpot"
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The Antonov An-12 "Cub"
The Illyushin Il-76 "Candid"
The Tupolev 134 "Crusty"
The Tupolev 154 "Careless"
But not all the Soviet cargo planes got degrading nicknames, sometimes the result of their R&D was so good that it was reflected in the NATO nickname the planes got.
Such as the graceful Ilyushin Il-62 "Classic"
Or the awesome Tupolev 144 "Charger"
Of course, given the similarity to a certain Anglo-French build supersonic design people know it by an unofficial nickname which is even more degrading than anything the NATO could have called it: "Concordski"
The majestic Antonov 124 "Condor"
And the enormous Antonov 225 "Cossack"
Nothing but admiration there and it's reflected in the names.