Simulation of air traffic
There are around 2.51 million flights globally every month, which works out to 83667 every day, 3486 every hour or 58 taking off every minute, so about 1 every second (on average). The video below is a simulation of global air traffic over 24 hours.
Here you can find the worlds busiest arfields by number of passengers. Hartsfield Jackson airport in Atlanta in the USA is the worlds biggest with almost 83 million passengers handled here every year (birdview)