Free E-tickets are growing in popularity among business fliers. By year's end, airlines predict that half of all tickets issued will be electronic. Orders can be processed automatically in a couple of minutes and passengers don't have to worry about lost tickets. Airlines are also beginning to align their ticketing systems so that transferring between carries will be less of a hassle.
Problems do exist.
No. documentation also makes it more difficult to keep track of expenses. For airlines, the cost-benefit is significant.