Your comprehensive reference guide to flight routes & prices terminology. Bookmark this page for quick access.
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- Airfare
- The price charged by airlines for passenger transportation between two points. Airfares can vary based on demand, advance purchase, time of travel, and class of service.
- Airline Alliance
- A partnership between two or more airlines that allows them to coordinate schedules, share routes, and offer reciprocal frequent flyer benefits. Major alliances include Star Alliance, OneWorld, and SkyTeam.
- Airport Code
- A three-letter identifier assigned to airports for scheduling and ticketing purposes. Examples include LAX (Los Angeles), JFK (New York), and LHR (London).
- Anchor Tenant
- A major airline that operates a significant hub at a specific airport, often commanding a large portion of flights and gates. This airline’s operations heavily influence pricing and route availability at that airport.
- APEX Fare
- Advance Purchase Excursion fare, a discounted ticket requiring advance booking, typically 14-21 days before travel. APEX fares often include restrictions such as minimum stay requirements and change penalties.
- Back-Haul
- A flight route that runs opposite to the primary direction of traffic, often offering lower fares due to reduced demand. Airlines use back-haul flights to reposition aircraft and fill otherwise empty seats.
- Base Fare
- The fundamental price of an airline ticket before taxes, fuel surcharges, and other fees are added. The base fare represents the airline’s revenue for the flight segment.
- Bearish Market
- A period when airline prices decline due to oversupply, low demand, or increased competition on a route. Travel during bearish markets often yields better deals for passengers.
- Belly Cargo
- Freight and cargo transported in the lower deck of passenger aircraft. Airlines often adjust passenger fares based on cargo demand to optimize revenue from available space.
- Bidding Up
- A revenue management strategy where airlines increase prices when demand exceeds expected levels. This tactic maximizes profit during high-demand periods.
- Black-Out Date
- A calendar date during which specific fare rules or promotional offers are not valid. Airlines use black-out dates to exclude peak travel periods from discount fare programs.
- Booking Class
- A cabin designation used for inventory control and revenue management, distinct from physical cabin configurations. Airlines use multiple booking classes within economy and premium cabins to manage pricing.
- Booking Reference
- A unique alphanumeric code assigned to a flight reservation used for check-in, modifications, and customer service. Also known as a confirmation number or record locator.
- Break-Even Load Factor
- The minimum percentage of aircraft seats that must be filled for an airline to cover operating costs on a flight. Load factors below this threshold result in losses for the airline.
- Bullish Market
- A period of high demand, strong pricing, and robust airline profitability on specific routes. During bullish markets, passengers typically pay premium prices for flights.
- Capacity
- The total number of available seats on an aircraft for a specific flight. Pricing adjusts based on how quickly capacity is being booked.
- Carrier
- An airline company licensed to transport passengers and cargo. The term is commonly used interchangeably with “airline” in industry discussions.
- Code-Share
- An agreement allowing one airline to sell seats on another airline’s flight under its own flight number. Code-share partnerships expand route networks and create pricing variations for the same physical flight.
- Competitive Set
- Airlines and routes that compete directly on a specific market segment, such as flights between New York and Los Angeles. Revenue managers monitor competitive sets to adjust pricing strategically.
- Consolidator
- A travel company that purchases airline tickets in bulk at discounted rates and resells them to travel agents or consumers. Consolidators often offer lower fares than direct airline bookings.
- Demand Curve
- The mathematical relationship between price and quantity of tickets sold on a given route. Airlines use demand curves to forecast how price changes will affect booking volume.
- Depreciation
- The gradual decline in ticket value as the departure date approaches, reflecting decreasing residual value. Airlines use depreciation models in yield management strategies.
- Direct Flight
- A flight with no stops between departure and arrival cities, though the aircraft may be the same throughout. A direct flight differs from a non-stop flight where the aircraft never lands.
- Dynamic Pricing
- An airline pricing strategy that adjusts fares in real-time based on demand, competition, and inventory levels. Dynamic pricing allows airlines to maximize revenue by offering different prices to different customers.
- Effective Competition
- Market conditions on a route where multiple airlines offer comparable service, creating pressure on pricing. Routes with effective competition typically have lower fares than monopolistic routes.
- Fare Basis Code
- An alphanumeric code on airline tickets indicating the specific fare rule, restrictions, and class of service purchased. Fare basis codes determine change, refund, and upgrade policies.
- Fare Class
- A category representing a combination of service level, pricing, and restrictions, such as economy, business, or first class. Each fare class has distinct rules regarding changes and cancellations.
- Fare Indexing
- A revenue management tactic linking ticket prices to specific cost indices, such as fuel prices or currency exchange rates. Fare indexing allows airlines to automatically adjust prices based on external factors.
- Fuel Surcharge
- An additional fee added to base fares to offset rising jet fuel costs. Fuel surcharges fluctuate based on global oil prices and can significantly impact total ticket cost.
- Global Distribution System (GDS)
- A computerized network used by travel agents and airlines to search, book, and sell airline tickets and hotel accommodations. The major GDS platforms are Amadeus, Sabre, and Galileo.
- Ground Stop
- An FAA directive prohibiting aircraft departures from specific airports, typically due to weather or safety concerns. Ground stops can affect route operations and create pricing opportunities.
- Hub-and-Spoke Model
- An airline network structure where flights connect through major hub airports, allowing efficient route coverage and pricing optimization. Hub-and-spoke networks dominate modern airline operations.
- Interline Agreement
- A contract between airlines allowing them to book passengers on competing carriers’ flights. Interline agreements enable seamless connections and revenue sharing among partners.
- Inventory Control
- The management of available seats across different fare classes to maximize revenue. Sophisticated inventory systems allocate seat availability based on demand forecasting and pricing strategy.
- Junk Fee
- Any supplemental charge beyond the base airfare, such as baggage fees, seat selection fees, or change fees. Junk fees have become a significant revenue stream for airlines in recent years.
- Load Factor
- The percentage of available seats filled with paying passengers on a flight. High load factors indicate efficient capacity utilization and strong demand.
- Lowest Logical Airfare (LLA)
- A pricing concept representing the minimum fare an airline should charge to remain competitive while maintaining profitability. LLA provides a floor for dynamic pricing strategies.
- Minimum Stay Requirement
- A restriction requiring passengers to remain at the destination for a minimum number of days to qualify for discounted fares. Minimum stay requirements are common on leisure fares.
- Non-Stop Flight
- A flight operating directly between two cities without any intermediate stops or aircraft changes. Non-stop flights command premium prices due to convenience and time savings.
- Overbooking
- The practice of selling more tickets than available seats, based on historical no-show data. Overbooking allows airlines to maximize occupancy but risks denying boarding to confirmed passengers.
- Passenger Revenue Management (PRM)
- The strategic practice of managing seat availability and pricing to maximize airline revenue. PRM systems analyze demand patterns and adjust inventory across fare classes accordingly.
- Point of Sale
- The location and currency in which a ticket is purchased, affecting applicable taxes and pricing. Airlines use point of sale data for market analysis and pricing strategy.
- Premium Cabin
- Aircraft seating classes offering enhanced comfort and service, including business and first class. Premium cabin pricing commands substantial markups over economy fares.
- Price Elasticity
- The measure of how demand for airline seats changes in response to price changes. High elasticity indicates that passengers are sensitive to price fluctuations on a route.
- Promotional Fare
- A temporarily reduced airfare offered by airlines to stimulate demand during slow periods. Promotional fares typically include restrictions such as non-refundability or limited booking windows.
- Redeye Flight
- A late-night or early-morning flight where passengers typically sleep during travel. Redeye flights often offer discounted fares due to reduced demand.
- Restricted Fare
- A discounted ticket with limitations on changes, refunds, or travel dates. Restricted fares require advance booking and impose penalties for modifications.
- Revenue Integrity
- Systems and processes ensuring that airlines collect all applicable revenue from bookings, including ancillary fees and proper currency conversion. Revenue integrity protects airline profitability.
- Revenue Management
- The science of maximizing airline revenue by strategically managing pricing, inventory, and capacity across flights. Revenue management systems use algorithms to optimize yield per available seat.
- Route Network
- The collection of flight paths and connections operated by an airline, forming the backbone of its service offering. Route networks influence pricing strategy and competitive positioning.
- Seat Pitch
- The distance between the same point on two consecutive aircraft seats, measuring legroom. Airlines offer varying seat pitches across cabin classes, affecting comfort and pricing.
- Seat Sale
- A promotional period where airlines offer discounted fares, often on specific routes or travel dates. Seat sales are commonly announced through email, social media, and travel websites.
- Segment
- A single flight between two consecutive airports on a multi-leg journey. Pricing is often calculated per segment and combined for total trip cost.
- Yield
- The average revenue earned per passenger or per available seat mile flown. Yield is a critical metric for airline financial performance and pricing strategy.
- Yield Management
- The practice of adjusting pricing and inventory allocation to maximize total revenue from available capacity. Yield management is central to modern airline economics.
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Last updated: April 2026