WorldSpan is listing only these fares:
4FMIACAY-AF NLX FARES
//MPM-WH 2844//
MIACAY-AF 24JUL05 $$ CO TX
ADD TAXES * FED INSP FEES * SEG/PFC CHARGES MAY APPLY
LINE FARE RT FARE TRAVEL DATES TKT DTE RTG AP MIN/ BKG
NBR CODE OW USD EFF DISC FST/LST NBR DT MAX CDE
1 KE R 931.00 1APR5 - - MPM - 3/ 2M K
2 Y 543.00 1APR5 - - MPM - - / - Y
3 A 585.00 1APR5 - - MPM - - / 2M A
4 S 650.00 1APR5 - - MPM - - / - S

However, when you sell a seat in S and pull up the seat map, this is what you get:
AVAIL: . Z-NO MOVIE B-BUKH H-HANDICAPPED I-BSCT >INFO AF MAP(
TAKEN: * G / U-UMNR Q-QUIET ZONE
SM AF 3949/S/29JULMIACAY - HORIZONTAL ONLY FOR THIS CARRIER
SM AF 3949 S 29JUL MIACAY 320
S
0
1234
E
F I.*
D -H*

C */.*
A ./..
)>

All other classes are showing a seat map with 3 and 3 seating ABC/DEF.