A cycle is counted from the first day of 1 period to the first day of the next period. The average menstrual cycle is 28 days long. Cycles can range anywhere from 21 to 35 days in adults and from 21 to 45 days in young teens.
Confidence votes 53. 28,537 is the number of commercial flights per day, according to the National Air Traffic Controllers Association. Shivam Gosai.
So in terms of planes per day, we've dropped from about 0.06 planes per day crashing to 0.03 planes per day crashing. Private planes in general aviation crash at a higher rate, but unfortunately data is harder to find on them.