Related Clues:

• Action center
• LAX or ORD, to United
• Old man is missing by centre
• Schubert holds the focus of activity
• Airport with many connecting flights
• JFK for American, e.g
• Atlanta, for Delta Air Lines
• Nerve center
• Airline's base of operations
• Where many connections are made
• Atlanta, to Delta Airlines
• Activity center, to an airline
• Centre of radiation?
• De Gaulle, to Air France
• Where spokes intersect