The air charter community has developed its own industry-specific business and technical terminology that may be unfamiliar to newcomers.

The Air Charter Guide has prepared this brief list of terms that a user of air charter is likely to encounter in conversation with charter professionals, in our publications, and on our website. In the glossary below, terms that are specific to CharterX are followed by (CX).

Airway distance: The actual (as opposed to straight line) distance flown by the aircraft between two points, after deviations required by air traffic control and navigation along established routes. The difference between this and straight line distance will vary throughout the country. Average figures would be between 5–9%.

Amphibious floats: FLOATS or "pontoons" equipped with retractable wheels that permit the aircraft to operate from paved airports.

ARO: Airport reservation office. Staffed by the FAA, this entity allocates landing and take-off reservations for unscheduled aircraft in and out of the following airports: JFK, LGA, EWR, DCA, ORD (see airport identifier listings for codes). Since these allocations are scarce and granted 48 hours in advance on a first-come-first-served basis, travel to these five airports may be difficult by charter. 

Block rates: A lower "contract rate" for scheduling significant amounts of charter time in advance on a pre-arranged agreement. 

Block speed: The average speed over a specific distance "block-to block", or door-to-door with respect to the airport gate. 

Broker margin: The difference between the flight charges assessed by the charter operator and the flight charges assessed by the charter broker.

Certificate: FAA-issued license (in this context sometimes referred to as ticket, part 135 license, etc.) to carry passengers for hire.

Charter broker: A company or individual that buys charter at wholesale and resells it at retail. The broker is responsible for payment to the charter provider, for assessing end-user taxes and fees, and for ensuring their customer's safety and satisfaction. A charter operator may act as a broker to provide supplemental lift to their customer.

Charter operator: A company or individual that holds aircraft charter certificates and provides charter services to retail and wholesale customers.

CharterX (CX): CharterX's online application for air charter sales and marketing. Available to recognized charter operators and brokers by annual subscription.

Charter Xchange Daily (CX): CharterX's opt-in daily email newsletter. It includes current relevant news, charter humor, paid announcements, tips on using Industry Exchange features, and imminent worldwide empty legs.

Commuter operator: A regional, scheduled airline. In this book limited to that operator with adequate fleet capacity as to be available of charter. Not all commuter airlines charter, because of the limitations of aircraft and crew availability. 

Corporate operator: A company flight department that has earned a part 135 certificate to carry passengers for compensation. 

Cruise speed: The aircraft speeds shown in the Aircraft Listings in this directory. Cruise speed is the normal speed attained at altitude once the aircraft is no longer climbing and is en route.

D-085: Page 85, section D, of an operator's federally mandated Operations Manual. This certified page lists all aircraft that the operator may legally offer for charter.

Deadhead: Originally a noun, now a verb meaning to fly the return leg of a trip without cargo or passengers. Originally coined during the infancy of the major airlines, the term was pejoratively applied to company employees or spouses, who were strapped into otherwise empty seats to give the appearance of high business volume. 

Duty time: That portion of the day when a crew member is on duty in any capacity (not just in the air). This can be a constraint on long day-trips, as there are FAA-imposed limits on the amount of time allowed on duty. Many charter operators have stricter rules, so it pays to inquire before planning a trip too tight to the limit. 

Empty leg: Also known as "one-way availability". Since charter trips typically charge for the round trip travel of the aircraft, empty legs can often represent relative bargains. These are usually posted as available for travel between two airports during a certain time period.

Exporter (CX): Refers to any program designed to export availability data from an operator's scheduling software to the availability calendar on the Industry Exchange.

FBO: Fixed-base operator, which represents a large majority of the air charter industry. By definition at a permanent location, this is a vendor of services, maintenance, fuel, flight instruction, and aircraft sales, in addition to charter. 

Fleet manager: A commercial aviation entity developed to subcontract the maintenance and operation of corporate aircraft, which are often chartered out to the general public. 

Flight time: That portion of the trip actually spent in the air. For billing purposes this definition is generally strict and only applies from moment of lift-off to moment of touch-down. 

Floats: Pontoons, or flotation devices, that enable an airplane (or helicopter) to land on water. 

GUID (CX): Global Unique Identifier. Refers to the alpha-numeric code assigned to each CharterX member's account on the Industry Exchange. This code allows an XQuote session initiated from a member's site to link to the appropriate data.

GADO: General Aviation District Office of the FAA. As the most local branch of the FAA, also the entity most likely to know the specific history of a charter operator. 

General aviation: That portion of aviation other than military or commercial scheduled operations. Commercial unscheduled operations, corporate flight operations, and private aviation are the most conspicuous members of this group. Most major metropolitan airports tend to have a separate "general aviation" terminal, where a chartered flight is likely to depart or arrive. 

Great circle distance: The shortest distance between two points on a globe. All distances shown in distance tables in the CharterX are "great circle distance". 

IFR: Instrument Flight Rules (flight in clouds). 

ILS: Instrument Landing System. Low-level approach equipment at certain airports. In The Air Charter Guide, airports with ILS systems are indicated in bold face type in the airport listings. Though instrument approaches and departures can be made in airports without an ILS, its presence is a material benefit to the travel planner because an instrument landing system improves trip reliability as closely as possible to the level of scheduled airlines, which generally fly from airports with these facilities. 

Independent operator: A charter operator that does not meet the definition of FBO or commuter, but may not be involved in contract management of aircraft. The larger independent operators, however, are very close to the fleet manager in business approach. 

Industry Exchange (CX): The industry-only area of the CharterX web site www.charterx.com. It serves as a resource center and virtual marketplace for the air charter industry. Users that subscribe to CharterX access additional enhanced features on the site that give them a sales and marketing advantage.
layover: A night spent in the middle of the trip in a city other than home base for the aircraft and crew. 

Leg: Describes one direction of travel between two points. Commonly used in referring to a planned itinerary, it may not indicate all landings such as fuel stops.

Lift: Any aircraft engaged for transport.

Medevac: Medical evacuation (usually emergency) seen in this book as a service of many helicopter companies. 

Net/net: The quote format that applies wholesale rates and does not include taxes or other end-user assed fees. Also known as a wholesale quote.

Part 91: The set of federal regulations that govern private aircraft use.

Part 135: The set of federal regulations that govern the commercial hire of jets.
positioning: Ferrying aircraft for departure from other than originating airport. (Also for return.) 
positioning time: Time estimated for an aircraft to travel to the trip departure position.

Preferred Vendors (CX): Operators that you are most likely to use for supplemental lift. They do not have to be CharterX members.

Propjet: A propeller driven airplane, in which the engine is a jet turbine rather than piston driven.

Qualified Volume Buyer, also QVB (CX): Recognized company or individual with a large demand for charter. Subscriptions are available for QVBs to use an adapted version of the CharterX features that allows them to manage internal requests for charter and to focus their use of preferred vendors.

Ramp: The apron or open "tarmac" in form of an FBO or terminal facility. This space is busy, used for deplanement, parking of aircraft, etc. Some facilities will permit automobiles to drive to the aircraft on the ramp, a feature of real benefit to the traveler with heavy or bulky luggage. 
repositioning time: Time estimated for an aircraft to return to its based position after completion of a passenger segment.

Retail customer: Also known as the "end user". This customer purchases charter for their own use and is assessed Federal Excise Tax (FET) and segment fees as applicable. Unless they have made special arrangements with a particular operator, they are usually quoted the market rate.

Retail quote: Quote provided to retail customer including taxes and end-user assessed fees.

Searches: Trip requests submitted by retail and wholesale customers through www.charterx.com, the CharterX Industry Exchange, volume buyer channels, CharterX customer XQuote systems, and other distribution channels. 

Segment: Describes the unit of flight between take-off and landing. Sometimes used interchangeably with the term leg.

Stage length: Distance of itinerary non-stop leg. 

Taxi time: That portion of the trip spent rolling between the gate, terminal, or RAMP and runway. 

VFR: Visual Flight Rules (flight out of clouds). 

Waiting time: That time that the chartered aircraft and crew must wait on the ground during any portion of the trip. 

Wholesale buyer: charter broker or charter operator that you allow to represent your aircraft to their customers.

Wholesale quote: Quote provided to a wholesale buyer for the purpose of resale. Applies wholesale rates and does not include taxes or end-user assessed fees. Also known as a net/net quote.

Wholesale rates: Discounted hourly rates offered to wholesale buyers for purpose of resale. Industry average is a 5% discount but the rate varies according to agreements between individual charter operators and charter brokers.

XQuote (CX): The online quoting feature enabled for CharterX member companies. The application is driven by user-supplied data and can be accessed by retail customers through a member company's own Web site.