21.   Air traffic controllers went on strike Tuesday, paralyzing operations in a country which is a regional hub for flights.

22.   American Airlines, which has its regional hub in San Juan, said Sunday it was canceling flights to other Caribbean islands.

23.   American Airlines, which has its regional hub in San Juan, announced Sunday it was canceling flights to other Caribbean islands.

24.   American Airlines, which has its regional hub in San Juan, said Sunday that it was canceling flights to other Caribbean islands.

25.   Bahrain is a regional banking hub and key base of the U.S. Navy.

26.   Bahrain is a regional financial hub and home to a key U.S. Navy base.

27.   Bahrain is a regional financial hub and is home to a key U.S. Navy base.

28.   Authorities in the regional hub Ho Chi Minh City said communications with Minh Hai province had been made very difficult due to felled power and telephone lines.

29.   Chau said the move was taken to turn Hong Kong into a regional broadcasting hub.

30.   Dubai has grown in a few decades from a small trading port to a regional hub for business, entertainment and tourism.