The World Tribune has this article up which claims that two Syrian fighters were downed by Israeli jets in September 2004, while giving details of an air-to-air engagement that according to prior reports, actually occurred in September 2001!
According to this article published by the Air Combat Information Group in 2003, the engagement occurred on September 14 2001, three days after the strikes on New York & Washington.
I think this might be a simple mistake since I can't think of any reason why someone would deliberately move the date of this event forward like this, other than perhaps to insinuate some kind of connection with current Syrian efforts to aquire better air defense systems from Russia.
Anyway, just remember that just because some publication says something or another happened "according to diplomatic sources", doesn't make the claim valid.
To the boys and girls at the world tribune: Do your bloody homework!