SAMANTHA BOMKAMPNEW YORK (AP) ¿ YRC Worldwide Inc., one of the nation's largest trucking companies, is disputing an analyst's prediction that it may be forced to close its doors as early as this weekend if it files for bankruptcy. YRC, based in Overland Park, Kan., on Wednesday extended for the sixth time its offer to debt holders to exchange the debt for new equity stakes in the company. The offer, considered a key step in the company's effort to avoid a bankruptcy filing, now expires at midnight Wednesday. It would free up much-needed cash but would also make current shareholders' stakes virtually worthless. The company said it made progress in its push to get a needed number of debt holders to swap their bonds for equity, though it still doesn't have enough to complete the swap ahead of a required $19 million interest and fee payment that must be made by Thursday. YRC said in a regulatory filing earlier this month that its "liquidity position would become unsustainable" and it would be forced to file for bankruptcy protection if it doesn't get access to a $106 million standby credit line and doesn't win a waiver from its lenders allowing it to delay the $19 million payment. If YRC does not complete the bond exchange, the company's last chance to avoid bankruptcy is a waiver from its lenders, according to Stifel Nicolaus analyst David Ross. If that doesn't happen, the company could file bankruptcy and close its doors as early as this weekend, he said.