DENVER -- The theory is a popular one in investment lore: Bad news is like a cockroach. See one and there's bound to be an army behind the baseboard.

Denver International Airport has had its share of bad-news cockroaches, and city officials are having a devilish time trying to stamp them out. Problems with the automated baggage system have caused three delays, downgrades by two rating agencies, and plummeting prices for airport bonds.

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