The spelling and grammar follow an established system and the meaning of each paragraph is clear and not confusing, follows Wikipedia's
Manual of Style.
There are enough references according to me. Citations are to highly reliable sources: Boeing's website, Royal Norwegian Embassy, NY Times, NYCAviation and the Ethiopian Airlines website news. I can find no original research.
It is broad in its coverage.
a (major aspects): b (focused):
It contains the major aspects of the subject, without going into unecessary detail.