I have a coming trip on the 19th of this month from Tunis to Osaka in J. When I check availabilty starting from Tunis I get 3 seats left in F and 0 in both J and Y for EK 748 and EK 316. But when I check the Dubai-Osaka(on the 20th) separately I get: 3 in F , 7 in J and 9 in Y. What does that mean? are the 2 flights overbooked or only the first one(EK748)?

Thanks for any insights

Cheers