point of no return

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point of no return

[′pȯint əv ¦nō ri′tərn]
(navigation)
A point along an aircraft track beyond which the aircraft's fuel supply will not permit it to return to its own or some other associated base but must continue in attempt to reach its destination.

point of no return (PNR)

point of no return (PNR)click for a larger image
The farthest point along a track to which an aircraft can fly and still return to the base with adequate fuel reserves. PNR invariably lies beyond the critical point unless the minimum reserve of fuel is carried. While there are many formulas for calculating PNR, the illustration indicates one in the simplest case, when an aircraft is flying from A to B in a straight line. See also critical point.
References in periodicals archive ?
Equitime is based in Isere, France and has a 38-strong team.
With nine major airlines becoming Class A shareholders in Equitime by contributing $5 million each in start-up capital--and smaller subgroups contributing proportionally--Equitime projects gross written premium of about $450 million, which would immediately cover its full $300 million retention.
Scott Russell, a managing director with Marsh's Minneapolis office, said Equitime would be capitalized through a private placement of stock with prospective members, including the 24 airlines belonging to the ATA and about 50 members of the Regional Airline Association.