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