“What kind of bagel can fly?”/“A plain bagel.”

There’s a popular bagel pun:
 
Q: What kind of bagel can fly?
A: A plain (plane) bagel.
 
Peter Flom tweeted the joke on September 25, 2010, explaining tha it was “a joke my kid made up when he was 5 or so.” The joke has been printed on several images.
     
 
Twitter
Peter Flom
‏@peterflom
A joke my kid made up when he was 5 or so:
What kind of bagel can fly?
A plain bagel !
8:01 PM - 25 Sep 2010
 
Twitter
Devon Collier
‏@smoothdev44
what kind of bagel can fly? a plane bagel lol
8:12 PM - 1 Jul 2011
 
Twitter
Hi, I’m Yansy!
‏@YansyFTW
What type of bagel can fly? ...A PLAIN ONE! Hahahahah xD
1:11 PM - 14 Feb 2012
 
BuzzFeed
21 Jokes So Stupid They’re Actually Funny
HA ha HA ha HA ha HA.
posted on Apr. 27, 2014, at 12:11 p.m.
Jessica Misener
(...)
5. What kind of bagel can fly?
A plain bagel.
 
reddit
What kind of bagel can fly? self.3amjokes
Submitted April 29, 2014 by andycooktellemHA HA HA HA
A plain one.
   
Facebook
World Of Puns
May 1, 2014 ·
What kind of bagel can fly?
 
The Amazingly Lame Joke of the Day
Wednesday, June 10, 2015
What kind of bagel can fly?
A plain bagel.
Posted by Tim Wycislak at 12:15 PM
 
Google Books
Lots of Knock-Knock Jokes for Kids
By Whee Winn
Grand Rapids, MI: Zonderkidz
2016
Pg. ?:
What kind of bagel can fly?
A plain bagel.
 
reddit
What kind of bagel can fly?
submitted May 25, 2016 by too-tsunami
A plane bagel.