A fleet can be constituted-of-or-filled-with (training aircraft).
A fleet of some f-16s may make_up a mainstay of an (air force).
A US-city may intensify (security checks) of a (commercial air fleet).
(Training jets) may match a (combat fleet) of a military-or-other-action-organization.
A reference to grounding a fleet can be an interpretation of comments.