There are diminishing returns in time-saving. The minutes saved blasting through the rarefied air of sixty thousand feet were so easily lost at the tollbooths of the Queens-Midtown Tunnel, lost again in the perpetual traffic jam on the Van Wyck Expressway, and lost again in the waiting line for customs clearance. (And every source of delay could be another business opportunity: IBM's vision of the future is its "Fastgate" system, which promises to cut your wait at immigration checkpoints to fifteen seconds. All you have to do in return for this savings is submit your "biometrics"-fingerprints and voiceprints-and other personal data for use in a state-of-the-art security database.) Airline marketing planners had actually imagined that business executives would fly from New York to London for lunch and back again that afternoon. Four airport taxi rides in a single day? Meanwhile, overseas telephone calls and E-mail and virtual conferencing became cheap and easy-real-time communication enough. Supersonic travel never found enough time-hungry travelers to become profitable.