定在上午6时的航班最可靠,超过94%的航班准时起飞。 Flights scheduled at 6 a.m. are most reliable, departing on time over 94% of the time.

排定在上午6时的航班是最可靠而且往往最便宜的,在该国30个最大的机场,超过94%的时间准时起飞,而下午6时的航班为79%。 Flights scheduled at 6 a.m. are the most reliable and often cheapest, departing on time over 94% of the time at the country's 30 largest airports, compared to 79% for 6 p.m. flights. United Airlines将早期航班标为“STAR”(开始飞行权利),这些航班在被禁足4小时或4小时以上后于上午9时前出发,而且更可能按期停留20%以上。 United Airlines labels early flights as "STAR" (Start the Airline Right), which depart before 9 a.m. after being grounded for four or more hours, and are 20% more likely to stay on schedule. 夏天的雷暴通常在下午形成,影响到以后的飞行。 Summer thunderstorms typically form in the afternoon, affecting later flights.