From June through August 1987, Premiere Airlines had the best on-time service of 10 United States airlines.From January through March 1988, Premiere Airlines had the worst on-time service of the 10 airlines. The on time performance ranking of the other nine airlines relative to each other remained unchanged.
Which of the following, if true, would most contribute to an explanation of the facts above?
【选项】Although all 10 airlines strive to keep their flights on schedule, overcrowded airports increased flight delays for all 10 airlines in January 1988 as compared with June 1987.
Which of the following, if true, would most contribute to an explanation of the facts above?
【选项】Although all 10 airlines strive to keep their flights on schedule, overcrowded airports increased flight delays for all 10 airlines in January 1988 as compared with June 1987.
