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Some of the effects upon air traffic of scheduling the aircraft and of controlling them en route are presented quantitatively in this report in the form of theoretical studies of four problems: (1) relations between the random en route deviations of aircraft from their schedules, and the resulting stack and total delays; (2) effectiveness of a single en route control point when (a) it reschedules the aircraft in an attempt to reduce terminal congestion; (b) it attempts to bring each plane back onto its original schedule; (3) congestion caused by relaxing the schedule; (4) effect of a sudden shutdown of the terminal. The limiting cases of random arrival and continuous control are discussed briefly, and some aspects of multipoint discrete en route control are treated. Numerical analysis, using IBM punched-card machines, is employed extensively in the first three problems. The fourth problem has been simplified enough so that purely analytic methods could be applied. It is presented merely for comparison purposes.