American Airlines says it will extend cancellations on 90 flights a day through to June 5 following the grounding of the Boeing 737 MAX aircraft over two deadly crashes in five months. The move by the US is biggest airline is the latest sign that the model is not expected to return to service anytime soon. On March 24 American Airlines said it would act 90 flights a day up until April 24. On Friday, Boeing also said it plans to cut its monthly 737 aircraft production by nearly 20 percent.