Boeing ( BA) faces more delays for its 787 Dreamliner, and its shares slipped Tuesday as a result.

The stock closed at $77.86, down $4.67, after The Wall Street Journal reported that parts shortages continue and the first flight could be pushed back until June. The paper said Boeing could announce a new schedule as early as Wednesday. The shares traded at a 52-week-high near $108 in July.

Last week, aviation Web site Flightblogger.com reported that the schedule for the first airplane had slipped by three weeks. "Boeing has shifted significant manpower resources" in order to catch up, the site said.

In December, Pat Shanahan, the 787 program's new chief, said parts shortages were decreasing and "the big push" was to turn on the first aircraft's power in late January. At that time, the first flight was to occur in March. Boeing had said earlier that delivery of the first airplane, originally scheduled for May, would occur in November or December.

A Boeing spokesman declined to comment on the reports.

A variety of analysts and aviation officials have suggested that more delays are likely, threatening the company's ability to deliver a promised 109 airplanes by the end of 2009 and triggering penalty payments to customers.

"With an all-new aircraft, you are inevitably bringing new technology to bear, and new manufacturing processes, and it will probably take longer than everybody would wish," John McMahon, CEO of Genesis Lease ( GLS), told TheStreet.com in December.

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