For a long time, power sources and air conditioning power required for aircraft while waiting on the ground have been provided by aircraft auxiliary power units (APUs). However, as an aircraft fuel-based engine, an APU has many drawbacks such as high energy consumption, high noise, extensive pollution manifestations, and severe pollution. Therefore, controlling the use of APUs or using replacement facilities for APUs is an effective means to reduce environmental pollution.
Hainan Airlines uses ground power units (GPUs) in place of APUs. According to the principle of "use where possible" specified by the Civil Aviation Administration of China (CAAC), Hainan Airlines has entered into agreements on the use of bridge containing equipment with 44 airports except for objective reasons such as equipment failure, with utilization rate of APU replacement facilities of 100%.

Hainan Airlines has identified 16 potential fuel-saving flight segments by analyzing the rationality of additional refueling.In 2023, fuel savings amounted to 10,368 tons under the residual oil control plan.

In 2023, Hainan Airlines launched a drinking water filling control project and the industry's first self-developed management system to identify room for optimization in the drinking water filling standard through data analysis.Through optimization, water consumption can be reduced by over 227 liters per flight for the Boeing 787 aircraft type, resulting in annual total fuel savings of 136 tons. In 2023, the whole fleet saved 1,152 tons of fuel in total.The project will reduce the aircraft load, improve fuel conservation and emission reduction, and help save water resources.

In 2023, Hainan Airlines' routes were air passages with specific widths and altitudes designated by the CAAC in a unified manner. They were invisible "air highways" used for the safe and orderly flight of aircraft.By taking planned and temporary optimization measures such as straightening inherent flight routes and actively applying for direct routes during flight, not only flight distances, fuel consumption, flight times and carbon emissions have been reduced, but also great significance has been created in terms of ensuring smooth operations through traffic diversion, improving operational efficiency, etc.