Business Aircraft Center at Danbury Airport in Connecticut is offering fuel-purchase incentives in the form of American Express gift cards. For purchases of 500 gallons or more, customers will earn one $50 gift card, and purchases of 250 to 499 gallons earn a $25 gift card. Business Aircraft Center recently remodeled its ­pilot lounge with new leather couches, free wireless Internet, HD television, flight-planning services and catering. More than 150 customers attended the FBO's July 4 barbecue, an annual event that new owners Lynda and Santo Silvestro plan to continue. Business Aircraft Center has 31,500 sq ft of hangar and office space and offers aircraft maintenance services.