Originally Posted by
Globaliser
What E class fares did you see when you ran the "Fare Information" query? And what rules (validity, stay, etc) were applicable? Did you find any fares whose rules matched your intended trip?
To answer my own question: All the valid fares that book into E class appear to be dual inventory fares. You need more than merely E class inventory. The fares require that there is inventory in V class and E class, or in X class and E class, or in T class and E class.
On the date you mention, all four flights have E class inventory (all at E9).
However, the only flight that has any inventory at all in V, X or T class is DL1712, which has T9 (but X0 V0). So on DL1712 you can book in to E class, using fare TAVNA0BC (according to ITA).