NEW YORK (MarketWatch) -- UAL Corp. uaua shares were halted Monday following rumors that the airline holding company was filing for bankruptcy, a rumor UAL said was completely untrue. An old news item on United Airlines seeking bankruptcy inadvertently resurfaced on a Web site, triggering a sell-off that wiped out nearly 76% of the company's share price. Shares more recently traded at $10.93, down about 11%. (This article was updated to correct the figure for the percentage decline of the sell-off.)