These days, it feels like airline perks have all but come to a screechy, bouncy, unsteady and nerve-racking halt. Fliers have come to expect nothing more than a scowl upon their request for a second glass of water. But a few airlines are still catering to their customers, and at a time when airport security is appalling and ticket prices high, they very well should be. The airlines here boast the best bonuses for economy-class fliers.