Question: What was the passenger fare for Lansing, when the passenger fare for Kalamazoo was $599.39?
SQL: SELECT "Lansing (LAN)" FROM "2-1637981-7" WHERE "Kalamazoo (AZO)" = '$599.39';

Question: For how many years did Detroit have a passenger fare of $307.29?
SQL: SELECT SUM("Year") FROM "2-1637981-7" WHERE "Detroit (DTW)" = '$307.29';

Question: What was the passenger fare for Grand Rapids, when the passenger fare for Detroit was $378.55?
SQL: SELECT "Grand Rapids (GRR)" FROM "2-1637981-7" WHERE "Detroit (DTW)" = '$378.55';

Question: Before the year 2010, and when Kalamazoo had a passenger fare of $517.32, what was the passenger fare for Detroit?
SQL: SELECT "Detroit (DTW)" FROM "2-1637981-7" WHERE "Year" < 2010.0 AND "Kalamazoo (AZO)" = '$517.32';