I see many getting their interviews in Dallas but mine is still under review, Soo frustrating. Did you try to contact USCIS. I tried calling but that robot doesn't transfer me to a rep
I filed in Dallas too, mine says 3 months left but it's so irrelevant as it changes. Mine went from 4 months to 3 to counting down in days until "day 1" to "this is taking longer than expected" then changed back to 4 then 3 months as of now...
I traveled to France last summer and I had 0 issues, they are familiar with it. I can only assume it will be the same way in Spain since they are both Schengen space