What is the relationship between lift and weight in an aircraft during flight?

In flight, the relationship between lift and weight is fundamental to maintaining a stable and controlled flight. For an aircraft to sustain level flight, lift must be equal to weight. This balance allows the aircraft to neither ascend nor descend. Therefore, lift must be greater than or equal to weight during different phases of flight.

During takeoff, lift exceeds weight to initiate ascent. In level flight, lift equals weight, allowing the aircraft to maintain altitude. When descending, lift can be less than weight as the aircraft is purposely decreasing altitude. Thus, lift must be at least equal to weight for sustained flight, supporting the concept that it must be greater than or equal to weight overall.

Understanding this relationship is crucial for pilots as it directly influences flight operations, stability, and performance. An imbalance could result in uncontrolled climbs or descents, highlighting the importance of maintaining proper lift and weight ratios throughout all phases of flight.