Perhaps the highest value promotion to float by cardholders this summer is hitting mailboxes this week. For travel between now and September 15, American Express cardholders can get a free companion ticket on Virgin Atlantic airlines, a free night at Summit Hotels and deeply discounted tickets from British Midland airlines for intra-Europe travel. According to CardWatch, Virgin Atlantic is offering AmEx cardholders two ‘Upper Class’ tickets to London for the price of one. A single ‘Upper Class’ ticket runs about $5,000 for roundtrip travel between Washington, DC and London. Virgin Atlantic’s ‘Upper Class’ service includes complimentary chauffeur-driven service at both the U.S. and London airports, access to VA’s expansive ‘Clubhouses’ and ‘Touch Salon’. AmEx cardholders can also receive a second night free at Summit Hotels & Resorts and a discount of up to 55% for each additional night. British Midland is offering AmEx cardholders a flat rate of $99 each way to fly to Brussels or Dublin. BM is also charging $139 each way for travel to Prague or Frankfurt.