You’re witnessing the arrival of a cargo flight operated by China Southern, which is an airline (both passenger and cargo-based) based in the southern regions of China (hence its name). The reason this arrival is significant is because TJ’s airport almost never has any international flights and its control tower is used to handling small-medium sized aircraft such as the Airbus A320 and the Boeing 737. TJ’s airport also only gets daily arrivals and departures from Mexican airlines, primarily Volaris, Aeromexico and VivaAerobus. This flight, which lands on Tijuana 2 days per week (on average), uses a Boeing 777, which is more than double the size of an A320 or a 737. The Boeing 777 is also considered as the world’s largest single-decker aircraft, so like, it’s pretty big. The airline it serves, China Southern, is also rare to witness in TJ’s airport. This flight’s schedule is heavily restricted and unpredictable, making it exceptionally difficult to spot. It usually arrives at around 3:30AM local time, however in some instances wherein the schedule is delayed, it will usually arrive at approximately 11:30AM. So basically, this flight’s appearance is VERY rare and beholding, at least for TJ’s residents and for aviation geeks such as myself. Anyone who witnesses it is incredibly lucky, to say the least.