题目选项分析

In an effort to increase revenues, Sky Air recently partnered with several airlines to create a joint frequent-flier program. In the new program, miles earned on all partner airlines can be combined for reward tickets valid on any airline in the partnership. Sky Air's CEO cites a recent increase in the number of passengers on all the partner airlines as evidence that the new frequent-flier program is having the desired effect. Industry analysts doubt the CEO's claim that the frequent-flier program is effective.

Which of the following, if true, best supports the analysts' position?

【选项】Air travel tends to be seasonal, with more passengers traveling during warmer months and holiday periods.