Originally Posted by
GUWonder
SkyMiles Select works to get main cabin 1 boarding on DL-operated flights in “basic economy”. Who knows what it does when such DL-coded flights touching the US are operated by KLM or Air Farce? Nothing, is my guess.
The T&C refer to the benefit in a couple places as "unlimited access to “Main Cabin 1” Priority Boarding on Delta and Delta Connection flights" so although they doesn't explicitly say, your guess seems like a good one since I think exclusion by omission would be the default.
But if the info sent over to partners in some form as status is, then it's plausible you'd still get something vaguely equivalent.
Also LOL at "Air Farce"