Currently the top-earning U.S. airline, Delta has intensified its focus on premium services, understanding that affluent travelers generate higher revenue per seat. Bastian noted that air travel was once viewed as a basic commodity, with most customers selecting the cheapest or quickest option. By repositioning itself as a customer-centric brand that values loyalty, Delta underwent a major transformation.
plt.xlabel("Gradient Updates")，这一点在钉钉下载中也有详细论述
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