I wouldn't take official advice from Continental Airlines's website - NOR from us here.
HOWEVER, I think it's pretty common knowledge that yes, what you say is correct, that any US Citizen - with a US PASSPORT - can enter Spain and stay for 90 days maximum without any additional visas, permissions, or documentation.
Go to the Spanish Consulate's page (this one's in Chicago) @
http://www.consulate-spain-chicago.com/ , click VISAS, and read the information there. Hmmmm. right now that website isn't working and I don't know why but do try it later.
Saludos, MadridMan
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