What feature is typically found at most airport gates for passenger boarding?

The feature typically found at most airport gates for passenger boarding is moving jetways or ramps. Jetways are designed to create a seamless transition from the terminal to the aircraft, allowing passengers to board and disembark safely and conveniently. They can be adjusted to accommodate different aircraft sizes and are equipped to handle the flow of passengers efficiently, making the boarding process smoother.

In contrast, helicopter pads are specialized zones for vertical takeoff and landing, not applicable to commercial airline passenger boarding. Large parking spaces are essential for vehicles in the vicinity of the airport but do not play a role in the boarding process itself. Maintenance hangars are used for the repair and upkeep of aircraft, again unrelated to passenger boarding activities. Thus, moving jetways or ramps are integral to ensuring safety and efficiency during the boarding process.