Which of the following is not a benefit of proper de-icing procedures?

Faster boarding times is not a benefit of proper de-icing procedures. While de-icing is crucial for maintaining the safety and performance of an aircraft, the primary focus of these procedures is to ensure that the aircraft's surfaces, particularly the wings and tail, are free from ice and snow. This is essential to achieving optimal aerodynamic performance, which directly affects flight safety and efficiency.

Proper de-icing can, in fact, lead to improved flight safety, as it helps to mitigate risks associated with losing lift due to ice accumulation. Enhanced aircraft performance is also a critical benefit, as clean aerodynamic surfaces ensure that the aircraft operates as designed in various weather conditions. Decreased operational costs can arise from fewer delays, maintenance issues, or accidents related to ice, but faster boarding times is not an objective of de-icing practices, as the focus is not on the boarding process but rather on ensuring the aircraft's readiness for safe flight.