I have not seen this one before, a mail purporting to be an e-ticket receipt from American Airlines for a flight on AA984 arriving New York JFK. As I had made no flight plans of any description, and had not flown AA for over a decade, I had little difficulty smelling a malware rat.
FLIGHT NUMBER AA984
DATE & TIME / DECEMBER 17, 2011, 11:53 PM
ARRIVING / NEW YORK JFK
TOTAL PRICE / 411.12 USD
Your bought ticket is attached to the letter as a scan document.
To use your ticket you should print it.
Thank you for your attention.
Anyway, AA984 does not fly to JFK, a quick check of AA's website shows this flight number to be a flight from Montevideo to Miami, which might be some indication of the origin of the scam.