In the face of the challenges posed by low-carbon aviation development to the aviation industry and the transformation of the emission reduction mechanism, based on the external perspective, firstly, the general expression of the environment damage model of aviation carbon emission and the element about the damage factors of carbon emission environment and the application of sensitivity analysis method were introduced and analyzed. Then, the external factors of carbon emissions in the airline network were analyzed systematically—The influence of the flight operation stage (LTO phase and cruise phase), the sector distance, the flight type and the terminal area airspace. The existing research showed that the two types of airline network model about the environment damage of aviation carbon emission were in different ways and sizes, and the city-pairs was lower than the hub-spoke; the environment damage of aviation carbon emission was the formation of the above four elements with the aircraft type and airline type. The hub airport’s carbon emissions triggered a challenge to the hub-spoke airline network model. In the low-carbon economy, corresponding suggestions on the airline network model were also faced with the hinterland market.