All three are also part of big airline alliances, which means you can get anywhere with miles in any of the programs. (rewardexpert.com)
Corporate travelers often book on big airlines that offer the most flights and flexibility because their plans change so often. (cnbc.com)
But, having approved the wave of mergers, it would be a bit rich for officials to complain that there are not enough big airlines to ensure competition. (economist.com)