As an aviation expert with extensive knowledge in the field, I've been closely monitoring the trends and statistics of air traffic worldwide. The number of planes in the air at any given time is a dynamic figure that fluctuates based on various factors such as time of day, day of the week, and seasonal variations. However, I can provide an estimate based on the data available.

The aviation industry is a complex network that involves countless variables, including the number of flights, the capacity of each aircraft, and the routes they take. According to the data referenced, in the past year, there was an average of 9,728 planes in the sky at any given moment, carrying an impressive 1,270,406 people. This number is a testament to the sheer scale of the industry and the reliance of modern society on air travel for both business and leisure.

The lightest day for air traffic, as noted, was the start of the new year, January 1, 2017, when at the day's peak, there were 3,354 planes in the air simultaneously. This is likely due to the holiday season, where many people are not traveling, and airlines may reduce their schedules accordingly.

It's important to note that these numbers are averages and can vary greatly. For instance, during peak travel seasons such as the summer months or holiday periods, the number of planes in the air can increase significantly. Conversely, during off-peak times, the number can decrease.

Moreover, the aviation industry is constantly evolving with new technologies and operational strategies aimed at increasing efficiency and reducing congestion. This includes the use of advanced air traffic management systems, more direct flight paths, and the implementation of more efficient aircraft designs.

In summary, while the exact number of planes in the air at any one time can vary, the provided figures give us a glimpse into the magnitude of daily air traffic. The industry is vast and ever-changing, with constant efforts to improve and adapt to the growing demand for air travel.

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And according to them, in the past year there were an average of 9,728 planes -- carrying 1,270,406 people -- in the sky at any given time. The lightest day for air traffic was the start of the new year, Jan. 1, 2017, when -- at the day's peak -- there were 3,354 planes in the sky at the same time.May 19, 2017read more >>