What happens if you need to get on the ground right away? In almost every case, any commercial plane flying is technically able to land even at close to its maximum takeoff weight.

Yes, a plane can land almost immediately after takeoff if an emergency is declared, such as an engine failure, bird strike, or a serious medical issue. This is known as an "Emergency Return" or "Air Return." However, for large, fuel-heavy aircraft, there is a technical challenge: the Maximum Landing Weight (MLW). Planes usually take off with a massive amount of fuel, making them much heavier than they are designed to be during a normal landing. If a pilot needs to land immediately, they may have to dump fuel over a designated area or fly in circles to burn it off to reach a safe weight. In a dire emergency (like an onboard fire), the pilots will perform an "Overweight Landing." Modern aircraft are built to handle this, but it requires a very long runway and an intensive structural inspection afterward to check for damage to the landing gear and fuselage. Air Traffic Control will always give priority to such a flight, clearing all other traffic to provide a straight-in path to the runway.