This is definitely a cover up this cancelling of flights because if anyone in the media was actually a journalist they would find that there are 1 - 2 new 737-800's coming into the mainline fleet a month for most of this year. I would say the total number of 737's is at worst the same number but probably a few extra airframes even after 4 being grounded. It is just a nice ploy to blame the engineers for something else. Meanwhile their 747's are having engine failures at an extraordinary rate because of a known problem which has a mod available to fix it....; Duty of Care???