IATA’s Passenger Intelligence Service (PaxIS)
database. This database captures market data
through IATA’s Billing and Settlement Plan (BSP) and
uses statistical estimates to address missing direct
sales, low cost carriers, charter flight operators, underrepresented
BSP markets, and non-BSP markets. It
provides traffic and price estimates for airport-pair
routes around the world (e.g. JFK-LHR, CDG-FRA).
However, data is only available from 2005 onwards.