"On Thursday, President Bush had an historic meeting"...
No. There is no such thing as "an historic" meeting. The President may have had "a historic" meeting. That's because the word "historic" begins with the letter 'h'. Idiots.
FWIW, I believe "an historic", "an historian", etc. are proper usages.
http://englishplus.com/grammar/00000167.htm
actually, "an historic" is gramatically correct.