Air transit refers to a stopover during a flight between two destinations. In other words, if you're traveling from one city to another and your flight requires a stop at an airport to switch to another plane to continue your journey, this stop is called air transit.

Typically, during air transit, you don't need to leave the airport and can wait within the airport for a specified period until your next flight is ready. However, if your transit lasts more than a few hours, you may want to leave the airport and explore the city.

For example, if you are traveling from Tehran to Los Angeles and your flight requires a stopover in Dubai, this stop in Dubai is called air transit.

Air freight is a cargo transport service that is carried out through airplanes. In this type of transport, goods and commodities are moved from one location to another using airplanes. Air freight refers to the companies or operators that provide these cargo transportation services. Air freight is used for transporting goods that require fast and secure delivery. This includes items such as frozen products, sensitive chemicals, medical products, or even emergency shipments. Air freight is usually contracted directly with airlines or air freight operators. These services are generally faster than land or sea transport and are very useful for goods with high value or time-sensitive schedules.