These words may look the same, but they mean something different.
Fleet (noun) – a group of boats or airplanes (sometimes also used for cars)
Fleet (verb) – pass (in time)
Fleeting (adjective) – passing quickly (in time)
Here are some examples of how you can use fleet and fleeting:
The Armada was a huge fleet of ships sent by Spain to destroy England, but it was defeated by the English in 1588.
The fishing company has a fleet of five boats.
Singapore Airlines maintains a modern fleet, with the average age of each airplane only seven years.
I was so busy that the winter just fleeted by.
It was unbelievable how fast time fleeted at the party.
Her beauty is fleeting away.
I gave the book only a fleeting glance, so I don’t really know what’s inside.
The witness got only a fleeting glimpse (= look) of the burglar, but he is sure it was a man.