score:3
If the marketing cabin is Y, then you're in economy.
You can also use the fact that Delta's "X" fare class is an economy class. It is unlikely to map to a business seat on another carrier.
Upvote:4
The 'cabin' codes are fairly well standardized:
But there are variations and special cases*. Though 100%, your Y cabin is economy.
Note, this is different from the fare code X which books into Y, as would M, N, Q etc.
*For example Etihad's The Residence. I do not know what code they use.