One of the two 787 Dreamliners in the fleet of Norwegian Air Shuttle ASA remains on the ground in Bangkok Friday due to problem with a hydraulic pump. This is at least the fourth problem the Norwegian carrier has had with the planes built by The Boeing Co. (NYSE: BA).

First there was the brake problem, which grounded one Dreamliner in Stockholm. Then there was the electrical problem that forced the airline to transfer passengers to an Airbus plane. Next came a problem with a hydraulic pump in New York that forced the airline to pay 70 passengers to stay in the Big Apple for another night.

At least the planes weren’t delivered until after the original electrical problems were found and fixed.

Norwegian Air Shuttle plans to expand its local service with Dreamliner flights to Asia and the U.S., and has another six Dreamliners on order. Boeing executives were in Oslo earlier this week to meet with the airline to discuss all the problems its been having. The airline’s CEO told The Wall Street Journal, “If this continues, it is totally unacceptable.” That’s probably an understatement.

Boeing’s shares have been trading down on Friday, and are currently changing hands at $118.39, down 0.8% for the day in a 52-week range of $69.18 to $120.38.