You are right, but the cause of returning more than single scalar was a typo, so its fixed now.
(BTW: Is the latter behavior really intended?)
Do you mean $count++ ?
If so, I need the previous value of @data, so if you can tell me a better solution I'll use it.
Because if I try the code as
if ( grep( /^$airline/, @data) )
it returns wrong value if there are additional notes in the definition file
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