This one caught my eye for a second. I thought, "I don't remember booking anything with American lately."  The lazy spammer didn't even bother to include any graphics to make it look official. 

Sender: American Airlines (information-no77537@aa.com)

Subject: Your Order##91991988

Text:
Dear Customer,

FLIGHT NUMBER 984
ELECTRONIC 746879098
DATE & TIME / NOVEMBER 17, 2011, 11:53 PM
ARRIVING / NEW YORK JFK
TOTAL PRICE / 321.56 USD

Please find your ticket attached.
You can print your ticket.

Thank you for using our airline company services.
American Airlines.

Attachment: AA_Ticket_#8565.zip

==================

Update:

I received the following variant on Nov. 28.  No attachment this time, just a link.  And this one didn't say which airline it came from (other than the signature, "Airlines America").  The price of my mythical flight has gone up, though.

Sender: support@rlweiner.com (gee, that's me!)

Subject: Fwd: Re: Your Flight Order N2295-505368

Dear Customer,

FLIGHT ELECTRONIC NUMBER 590191204
DATE & TIME / DECEMBER 26, 2011, 16:13 PM
ARRIVING AIRPORT: NEW YORK JFK
PRICE : 411.35 USD

Please download and print out your ticket here:
http://www.airlines.com/flight-06250762055

BRITTNI BEAL,
Airlines America

Fingerprint: f8a09213-4b65e7cd