A B-29 develops hands and feet when it needs to in Little Johnny Jet (released in 1953). For example, when it’s kicked out of the reenlistment headquarters because he’s obsolete. The U.S. Air Force is only taking jets.
Here are some frames. I like the smug jets in the background.
A number of years ago, someone asked me if a short cut had been made at the 5:29 mark, pointing to a soundtrack record released a number of years ago where Volga Boatman was played for a few seconds then there was the sound of an explosion—something not heard in the version of the cartoon in circulation. Was a Russian sight gag cut? As an Avery cartoon might say “Mmmmm....could be!” But I really don’t know for sure.