Several. Or "a bunch". Or "more than a dozen". Regardless of whether people will use a "couple" to mean an indeterminate small number that may be more than ex

Several. Or "a bunch". Or "more than a dozen". Regardless of whether people will use a "couple" to mean an indeterminate small number that may be more than exactly two, it doesn't mean 16 jets, as 16 is a large number of jets to be doing something together, unless one is intentionally understating. How many planes are in the air at a time? "A couple"