HONG KONG — Boeing’s newest and most sophisticated jet, the 787 Dreamliner, suffered more mishaps on Friday, when All Nippon Airlines of Japan reported incidents involving planes on two domestic flights.

Cracks appeared Friday in the cockpit window of a 787 Dreamliner heading from Tokyo to Matsuyama, in southern Japan. The flight, NH585, which was carrying 237 passengers and nine crew, left Haneda Airport in Tokyo at 9:35 a.m. local time and landed safely. No one was injured, a spokeswoman for the Japanese airline, Megumi Tezuka, said by phone from Tokyo. The return flight, NH590, which had been due to leave just before midday, was canceled to allow for the window to be replaced.

Ms. Tezuka added that this was the third time that cracks had appeared in the windshield of one of the 17 787s operated by A.N.A.; the other two incidents happened last year.

The cracks appeared on the outermost of five layers that compose the cockpit windshield and did not endanger the aircraft, Ms. Tezuka said. Moreover, cracks of this kind are not unique to the 787 Dreamliner; cracks have appeared in other aircraft types operated by All Nippon from time to time.