How to link two separate flight reservations

Linking two reservations tells the airline that two separately-booked passengers are travelling together. It is free, it takes one phone call, and you need both six-character record locators. Do it as soon as both tickets are issued — not at check-in, when there is nothing left to arrange.

What linking actually does

Inside an airline's reservation system, each booking is a separate record. Linking (also called cross-referencing or associating) writes a note into both records pointing at the other. From then on, anyone who opens either booking — a phone agent, a gate agent, the rebooking robot at 3am — can see that the two of you are one party.

The practical effects:

• Irregular operations. If the flight is cancelled or badly delayed, automated rebooking tends to keep linked passengers on the same replacement flight instead of scattering them onto whatever seats are free.
• Schedule changes. When the airline moves a flight by hours, linked records are usually reaccommodated identically.
• Seating help. An agent or gate agent can see the association and act on it when trying to seat you together, and a linked record is much easier to argue from.
• Upgrades and standby. On several carriers linked parties clear standby or upgrade lists together rather than one of you going and the other staying.

What linking does not do

It does not merge the bookings into one. Each ticket keeps its own record locator, its own fare rules and its own price, and any change or cancellation is handled per ticket. It does not transfer anything: your friend's seat, bag allowance or elite benefits stay theirs.

Above all it does not assign seats. Linking is metadata, not a seat request. You still have to open each booking's seat map and pick adjacent seats yourself, and on basic economy fares that option may not exist at all. If your goal is specifically two seats in the same row, read how to sit together when you booked separately.

What you need before you call

• Both record locators — the six-character alphanumeric codes on each confirmation.
• The lead passenger name on each booking, spelled as it is on the ticket.
• The flight number and date, so the agent can confirm you are on the same flight.
• Confirmation that both tickets are ticketed, not merely held. A held or pending booking cannot be linked.

Almost every major carrier still requires a phone call for this: the manage-booking pages have no linking control. Some airlines will do it over social media DMs or web chat, which is worth trying if hold times are bad. If you have not yet booked the second ticket, start with why you cannot add a passenger to an existing reservation — you need two tickets before there is anything to link. You can find their exact flight in a few seconds by dropping their confirmation screenshot into SameFly.

How to ask, airline by airline

American Airlines

American calls it cross-referencing. Call Reservations, give both record locators and say: "Please cross-reference these two records, we're travelling together." Ask the agent to confirm the note is on both. Once done, ask them to look at the seat map while you are on the line — they can often move you into a pair that the website will not offer.

Delta

Delta agents say "link" or "associate". Give both confirmation numbers and ask for them to be linked as one travelling party. Delta is also the carrier most likely to seat a linked party together proactively — but Basic Economy still blocks advance seat selection, so if one of you bought Basic, expect seats at check-in.

United

United uses "cross-reference" too. Call, provide both confirmation numbers, and ask for the records to be cross-referenced. United's Basic Economy fares assign seats at check-in unless you pay, so ask the agent explicitly whether adjacent seats are selectable on your fare before you hang up.

Southwest

Southwest has moved to assigned seating, and each passenger has their own confirmation number. Call and ask them to link the confirmation numbers as a travelling party, then check the seat map. Southwest's saving grace is that changes are free — if the seating is wrong you can move to another flight without a change fee.

JetBlue

Call JetBlue and ask them to link the two confirmation codes. JetBlue's agents will normally also try to seat you together on the call. Blue Basic restricts advance seat selection, so linking is doing all the work it can on that fare and no more.

Alaska

Ask Alaska to associate or link the two confirmation codes. Alaska is the most flexible of the six about moving seats at the same time, so treat the call as one job: link, then fix seats before you hang up.

Timing, and what to do if you forgot

Link as soon as both tickets are issued. The value of linking is almost entirely in what happens before the day of travel — schedule changes, cancellations, seat maps opening up as elite members shuffle. At check-in there is nothing left for the link to influence.

If you only remember at the airport, it is not wasted. Ask the check-in agent to note that you are travelling together and to look for a pair of seats; if nothing is available, ask again at the gate about 30 minutes before boarding, once no-shows and upgrades have shaken the map out. Gate agents can move people the website will not.