Does Airport Preferential Policy Aggravate the Competition of Aviation Hubs in Central and Western China? Based on the Investigation of 78 Airports

<div>Distribution map of standard change degree of passenger and cargo flow at Xinzheng Airport and other airports.</div>

Mathematical Problems in Engineering

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Figure 2

Figure 2: Does Airport Preferential Policy Aggravate the Competition of Aviation Hubs in Central and Western China? Based on the Investigation of 78 Airports 

Figure 2 | Does Airport Preferential Policy Aggravate the Competition of Aviation Hubs in Central and Western China? Based on the Investigation of 78 Airports 