|Rank|City|Passengers|Ranking|Airline|
|---|---|---|---|---|
|1|United States, Los Angeles|14,749||Alaska Airlines|
|2|United States, Houston|5,465||United Express|
|3|Canada, Calgary|3,761||Air Transat, WestJet|
|4|Canada, Saskatoon|2,282|4||
|5|Canada, Vancouver|2,103||Air Transat|
|6|United States, Phoenix|1,829|1|US Airways|
|7|Canada, Toronto|1,202|1|Air Transat, CanJet|
|8|Canada, Edmonton|110|||
|9|United States, Oakland|107|||

Question: how many airlines have a steady ranking?
Answer: 4