i alaways find free transfer.. but i don't know what do we mean by this,can anyone help me?

Category 9: Transfer restrictions
1 TRANSFER PERMITTED IN EACH DIRECTION FREE
ONLINE ON THE PRIMARY CARRIER
INTERLINE INCLUDING THE PRIMARY CARRIER
FREE BETWEEN AA AND AA/G3/JJ/LA/LP/4M IN COLOMBIA IN
EACH DIRECTION.
AND - 3 TRANSFERS PERMITTED IN EACH DIRECTION FREE
ONLINE ON THE PRIMARY CARRIER
FREE IN THE UNITED STATES IN EACH DIRECTION
FARE BREAK SURFACE SECTORS NOT PERMITTED AND
EMBEDDED SURFACE SECTORS PERMITTED ON THE FARE
COMPONENT.


thanks

Need a lot more information
This is for a cash/award/?? flight from ??? to ???? on ??? airline/airlines (AA?)

Within Columbia, one may make one connection, outbound and again on the return, between the primary carrier (e.g. AA) and any of these airlines: AA/G3/JJ/LA/LP/4M without any charge.

Within the United States, one can may up to 3 connections in each direction (outbound and return) wholly on AA (e.g. one can't connect from UA to AA on this fare).

One cannot fly nonstop from Chicago to New York and have the ticket priced as if you were flying from Chicago to Cleveland to New York.

Your entire itinerary, under this fare, must be via air; you may not - for example - fly from Chicago to Cleveland, drive from Cleveland to NYC, and resume your flying between JFK and Columbia. If you were to do that, you would have to purchase ORD-CLE as a separate domestic trip.

my question is what do we mean by this Transfer restrictions?I don't understand the meaning of this sentence

It basically tells you how many connections (plane changes) you are allowed to make, and where.

In this case, AA only flies to Miami, Washington (DCA) and Dallas/Fort Worth from Bogota (BOG). Suppose you're in Boston and you want to get to Cartagena (CTG). You can change planes up to three times en route from Boston to one of AA's three U.S. gateways to Colombia. You may then change again at BOG for a flight to CTG. And you can change the same number of times when you return.

What's the advantage? I think it doesn't have a relation with the stopover,one time i've seen that i can go to thailand and have a transfer in an japan's city,what are the ++ of this transfer? Thank you and sorry for asking to much!

The advantage is to the airline is to stop you from circumnavigating the globe on the fare. Also to control how you can route, limit the number of carriers the airline needs to share the money with etc

Even if it was unlimited transfers, there are other limits in other parts of the fare rules that would stop you from adding on to the fare. For instance Routing rule, Maximum Permitted Mileage (MPM), date restrictions, end on end ticketing, Maximum stay, minimum stay, carriers allowed to operate etc

The only advantage with transfers is on an international itinerary a transfer is considered a stop of under 24 hours so say you can stay long enough to visit a friend for lunch or if you just want to see a new city or stretch your legs, take a nap etc

Stop-overs are completely different

A "transfer" is commonly called a connection. Specific fares have limitations (restrictions) on how many transfers are pemited, where those transfers may take place, and what airlines may be utilized. Without such restrictions, an airline may un-wantingly sell a traveler a ticket from New York to Bogota with a transfer occurring in Paris. Or they might sell a ticket from Los Angeles to Bogota with transfers in Phoenix, Salt Lake City, St. Louis, Minneapolis, Chicago, Detroit, Atlanta, Washington, and New York. It is easy to understand why transfers are restricted.

1 free transfer in europe means that i can choose the city i want in europe for a layover And paying the same price, for example i want to go from FRA to JFK in UA and i choosed a transfer in CDG,the itinerary will be FRA-CDG-JFK and first segment will be on LH,it is possible to do it?

It might be time for you to consult a travel agent who can explain these things to you in your native language.

If the routing rules allow a stop in that specific city and if the flight restrictions allows that airline combo.


Good idea

Usually the fare rules allow transfers at natural places in the carrier's or alliance's network. In your example, without having looked at anything specific, I would guess that FRA-CDG-JFK on AF is allowed or CDG-FRA-JFK on LH (or CDG-FRA/MUC on LH connecting to FRA/MUC-EWR on UA), but it's likely to be expensive to get FRA-CDG on LH connecting to CDG-JFK on AF on a single ticket. Note also that if you spend more than 24 hours in Paris, this will count as a stopover and require a more expensive fare in general.

LH doesn't fly CDG-JFK but its partner UA probably does CDG-EWR.