Originally Posted by
abefroman329
It's a grey area when it comes to the written word. If I'd written the sentence, I would have said "a FF," since "FF" is an abbreviation of "frequent flyer," and you wouldn't say "an frequent flyer."
Agreed. If the FF is vocalised as "Ef Ef" then "an FF" is correct but if it is vocalised as "Frequent Flyer" then "a FF" is correct and since the intent of the author is unclear one can't fault the author for using either.