user: Question: What is the fare to Kalamazoo during the time frame when Saginaw's was $481.39?
Columns: ['Year', 'Lansing (LAN)', 'Detroit (DTW)', 'Grand Rapids (GRR)', 'Flint (FNT)', 'Kalamazoo (AZO)', 'Saginaw (MBS)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [2006.0, '$370.61', '$322.83', '$413.74', '$298.89', '$472.93', '$441.26']
SQL:

assistant: SELECT "Kalamazoo (AZO)" FROM "Table" WHERE "Saginaw (MBS)" = '$481.39';