"fleet by" is a correct and usable phrase in written English.
You can use it to describe something moving by quickly or swiftly. Example: The trees seemed to fleet by as we drove down the highway.
It will also double its Reaper drone fleet by 2020.
Air‐conditioning of the entire city subway fleet by 1981.
They also proposed a law that would reduce the fleet by one-third.
So far this year, attrition has reduced the fleet by three.
The blessing of the fleet by the bishop of Bathurst is a notable annual (July) event.
He plans to double the size of his fleet by the end of the year.
A city official said Mr. Bloomberg had shrunk the size of mayor's fleet by 37percentt.
For now, transportation officials are renovating the current fleet by replacing critical parts.
It expects to have the technology installed on its entire domestic fleet by next summer.
Ford, for example, has set a goal of releasing an autonomous vehicle fleet by 2021.
This would increase Britain's merchant fleet by as much as 150 per cent.
