Chained flights
Pairs of empty legs on the board where the second flight leaves from the city the first one lands in, on the same day or the day after. Two aircraft, two operators, two enquiries. Nobody sells these as one trip; the board just makes them visible.
Reading the board.
Operators publish the date of an empty leg, rarely the time. A same day chain can fail on the clock: the second aircraft may leave before the first one lands. Confirm times with both operators before you count on the connection. Prices are each operator's own figure for the whole aircraft; a missing price means the operator asks you to enquire.
An empty leg goes one way, on one date, and rarely where you happen to need it. Put every operator's list in one place and some of those flights line up: a jet repositioning into a city on Tuesday and another leaving that city on Wednesday. Each operator sees only its own aircraft, so the pair is invisible to both of them.
The chain is only as firm as its weaker half. Either flight can be sold, moved or withdrawn without notice, and a chain that looks good today may be gone by tonight; the flight pages show when we last saw each one. If you want the pair, enquire on both flights the same hour.