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.
Source(s): http://www.faa.gov/data_statistics/aviat... Between General Aviation (private, corporate and charter aircraft) and Commercial aircraft (passenger airlines and commercial air freight) there are somewhere around 250,000 aircraft registered in the USA. It should be noted though that the vast majority of this number are small privately owned aircraft and are not in daily use. A more realistic number of aircraft flown daily in the USA is probably closer to 10,000. JetDoc Â· 1 decade ago.