Jokes about the September 11, 2001 terrorist attacks on New York City’s World Trade Center are numerous, although not politically correct. One popular joke was posted on Twitter on September 10, 2013:
   
“9/11 jokes are only funny if you can land them correctly.”
   
A slightly different version was posted on Reddit—Jokes on May 8, 2017:
   
“The problem with 9/11 jokes is that they never seem to land.”
   
   
Wikipedia: September 11 attacks
The September 11 attacks (also referred to as 9/11) were a series of four coordinated terrorist attacks by the Islamic terrorist group Al-Qaeda on the United States on the morning of Tuesday, September 11, 2001. The attacks consisted of suicide attacks used to target symbolic U.S. landmarks.
 
Four passenger airliners—which all departed from airports on the U.S. East Coast bound for California—were hijacked by 19 al-Qaeda terrorists to be flown into buildings. Two of the planes, American Airlines Flight 11 and United Airlines Flight 175, were crashed into the North and South towers, respectively, of the World Trade Center complex in New York City. Within an hour and 42 minutes, both 110-story towers collapsed, with debris and the resulting fires causing partial or complete collapse of all other buildings in the World Trade Center complex, including the 47-story 7 World Trade Center tower, as well as significant damage to ten other large surrounding structures.
       
Twitter
ZoeSZN 🇭🇹‏
@_cocoa_LOVE
Stawwwppppp “@ChinksMcGee: 9/11 jokes are only funny if you can land them correctly”
10:30 PM - 10 Sep 2013
 
Twitter
TD‏
@Tdolla____
”@ChinksMcGee: 9/11 jokes are only funny if you can land them correctly"aww
10:36 PM - 10 Sep 2013
 
Twitter
jalen‏
@JR_hearts
Y’all can’t land these 9-11 jokes properly
9:35 AM - 11 Sep 2013
 
Twitter
I A N‏
@Ianmurray7
It’s tough to land 9/11 jokes.
9:26 PM - 30 Mar 2015
 
Twitter
Mike Degrasse Tyson‏
@100DollarChill
I like to tell 9/11 jokes but they never land
8:07 PM - 19 Apr 2015
 
Twitter
Tyler‏
@gylertagan
9/11 jokes aren’t funny, they never land.
11:57 AM - 7 Aug 2015 from Warwick, RI
   
Twitter
Living Sarcasm‏
@SarcasmLiving
The problem with 9/11 jokes is that
they never seem to land.
11:38 PM - 8 May 2017
 
Reddit—Jokes
The problem with 9/11 jokes is that
submitted May 9, 2017 by James75196
they never seem to land.