[NFump]

J/R also says what's not a play:

It is not a play if there is only

(1) an appeal (although a play can occur during an attempt to appeal)
(2) a fake or feint of a throw, or an interruption of a throw,
(3) a step or several steps toward a base or runner that do not result in an actual tag attempt,
(4) a dropped line drive or pop fly.

No mention in either section of what is a play or what is not a play about a caught line drive or pop fly.