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In 1955, Delta Air Lines pioneered the hub-and-spoke system at its hub in Atlanta, Georgia, [3] in an effort to compete with Eastern Air Lines. In the mid-1970s FedEx adopted the hub-and-spoke model for overnight package delivery. After the airline industry was deregulated in 1978, several other airlines adopted Delta's hub-and-spoke paradigm.
C 6 H 6 (l) 124.5. 31.00. The standard Gibbs free energy of formation of a compound is the change of Gibbs free energy that accompanies the formation of 1 mole of that substance from its component elements, in their standard states (the most stable form of the element at 25 °C and 100 kPa). Its symbol is Δ fG ˚.
Delta underwent a cabin branding upgrade in 2015. [69] Availability and exact details vary by route and aircraft type. Delta One Delta One Suite. Delta One is the airline's premier business class product, available on long-haul international flights, as well as transcontinental service from New York–Kennedy to Los Angeles and San Francisco. [69]
Airline hub. An airline hub or hub airport is an airport used by one or more airlines to concentrate passenger traffic and flight operations. Hubs serve as transfer (or stop-over) points to help get passengers to their final destination. [a][b] It is part of the hub-and-spoke system. An airline may operate flights from several non-hub (spoke ...
In dental anatomy, the apical foramen, literally translated "small opening of the apex," is the tooth's natural opening, found at the root's very tip—that is, the root apex — whereby an artery, vein, and nerve enter the tooth and commingle with the tooth's internal soft tissue, called pulp. Additionally, the apical foramen is the point ...
Aviation safety. AC 25.1309–1 is an FAA Advisory Circular (AC) (Subject: System Design and Analysis) that identifies acceptable means for showing compliance with the airworthiness requirements of § 25.1309 of the Federal Aviation Regulations. Revision A was released in 1988. In 2002, work was done on Revision B, but it was not formally ...
Force protection condition. In United States military security parlance, the force protection condition (FPCON for short) is a counter-terrorist (otherwise known as antiterrorism (AT for short)) [1]:1 threat system employed by the United States Department of Defense. It describes the number of measures needed to be taken by security agencies in ...
The pulp is the neurovascular bundle central to each tooth, permanent or primary. It is composed of a central pulp chamber, pulp horns, and radicular canals. The large mass of the pulp is contained within the pulp chamber, which is contained in and mimics the overall shape of the crown of the tooth. [2] Because of the continuous deposition of ...