“Why is it so hard to recognise a pilot?”/“They always travel in disguise.”

“Disguise” can sound like “de skies” (the skies). A pun is:
     
Q: Why is it so hard to recognize a pilot?
A: They always travel in disguise.
   
The joke was posted on Reddit—Dadjokes on June 30, 2015, when the British spelling “recognise” was used.
   
“Why are airplanes so hard to see?”/“Because they’re in disguise” is a similar riddle.
       
   
Reddit—Dadjokes
Posted by u/lm014 June 30, 2015
Why is it so hard to recognise a pilot?
They always travel in disguise.
COMMENTS
GrandWizerdBoba
Disguise… de-skies.. hah
       
Twitter
Dad Jokes by dadbot
@dadbot2000
Why is it so hard to recognise a pilot? They always travel in disguise. http://ift.tt/1U3t71v
2:41 PM · Jun 30, 2015·IFTTT
   
Twitter
Aspire2Learn
@Aspire2Learn
Bad Joke Of The Day :
Why is it so hard to recognise a pilot?
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They always travel in disguise.
8:58 AM · Jul 1, 2015·Twitter Web Client
 
Twitter
John Junyszek
‏@Unyshek
Terrible Joke Tuesday!
Why is it so hard to recognize a pilot?
They always travel in disguise
2:09 PM - 13 Dec 2016