Originally Posted by pbd456

i am not sure what you are talking about. you are saying that the eticket is in J sector, but is not confirmed? confirmed in J but no seat assigned?
if there is no space in J so, it must be confirmed in Y class. so it is a voluntary downgrade (one accepts the reservation).

for example i have an eticket like this

AONE5 fare.
SEZ LHR A
LHR HND A
HND HKG A
HKG SIN D
SIN NRT D
NRT HKG D
HKG JFK A
JFK GRU A
GRU BOG J
BOG SCL J
SCL IPC J
IPC SCL J
SCL LHR A
LHR DXB A
DXB LHR A
LHR NBO A

The fare basis is A class, yet i am on D on some sectors J on some sectors.

If there is A class on some flight, I can make a change and pay the fee (if applicable). it requires a reissued. just because the fare basis is A class does not mean that I can fly first class.