Dont know if this belongs here; but anyway,
flew mel-syd-lax-lhr (one pnr) then lhr-gla with BMI (on a separate pnr).
When checking in at mel bags where tagged all the way through to GLA.
big ^ to UA!
When flying from GLA, BMI check in wouldn't do the same (and i had to pick up and check in again with UA)- you would think if UA does it BMI could too...