Airlines' offering discount for tickets one after another results in change of ticket price arrangement in airline market.
航空公司竞相给机票打折引致了民航客运价格安排的变迁。
Since the airline charges a $150 change fee, the $100 ticket price difference is less than the $150 airline fee;
因为航空公司将会收取150美元的手续费，而100美元的差价小于150美元的手续费；
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