I was looking at my chances of getting an EUA on an EWR-SJO flight. I'm flying out of EWR on 1/25 and returning 2/4. In both cases my flight (1762/1761) has zero availability on all BF classes (if I read KVS right.) The other flight in the day (1796/1797) seems to have tons of availability. In the other classes, my flight seems to have more availability than the other one. I thought that maybe my flights do not have a BF cabin but all planes are 738. Is there any explanation for this ?