etween airports in each pairing was calculated along with the appropriate averaging of outcomes from the pairings. Findings showed that deregulation did not result in a decrease in nonstop jet service since in most cased this did not exist in the first place. The average coverage for the flights improved considerably; weighted average of coverage rates went from 26.2% to 43.3% from 1977 to 1989, implying that average travel times have not doubled since deregulation and large numbers of content passengers are now being congested at hub airports. In addition findings showed that passenger traffic was twice as high in 1989 and this is presumed to be due to increased nonstop coverage. However it may also be possible that this coverage would have grown without deregulation.
Blairáand Hanleyá(2001) reported that following deregulation of the airline industry, changes included increased competition, which resulted in lower airfares, frequent flier programs, and increased frequency and extent of service. The market structure has change
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