Some Muslim cab drivers are refusing service to a growing number of passengers with alcohol or dogs, and officials at Minneapolis-St. Paul International airport are trying to fight it. "Our expectation is that if you're going to be driving a taxi at the airport, you need to provide service to anybody who wants it," said Patrick Hogan, spokesman for the Metropolitan Airport Commission. Each month, about 100 people are denied cab service at the airport. Refusals for religious reasons have grown in recent months, airport officials said. About three-quarters of the 900 taxi drivers at the airport are Somali, many of them Muslim.