W Class is an extra class for elite-awards. On the Delta page is written :

Air France:
Mileage may be earned on Air France-coded flights operated by Air France or any SkyTeam partner. Mileage credit is not applicable for fares booked in L, N, O, G, or X class, for Air France travel via boat/ferry service, or for flights to/from Havana, Cuba.


On the continental page is written :

First & Business Class P, F, J, C, D, I, Z 150% 150% 2
Full Fare Economy Class Y, S 100% 150% 2
Economy Class B, K, M, R, A, H, T 100% 100% 1
Discount Economy Class V, L, Q, U, N, W, E 100% 50% 0

So you can earn miles on DL or CO on W-Class ?