With total respect for both of your ears, we must be listening to a different piece of music or perhaps
you are both listening to the opening arpgeggiated leit motif that the orchestra plays before the theme begins
in the first four bars of the music before the actual theme begins.

My wife and I listened to both the Boston Pops and the LA Philharmonic versions of
Leia's Theme from Star Wars:

Both open up with this modulating minor key arpeggiation which is NOT the theme of the music.
this is how these orchestras play the main leitmotifs and them:

descending D C# D B C# Bb C A repeated twice on flute or piccolo
then G #F G E #F D# F D nat
G #F G D# F# D nat played on oboe

then the theme begins played on French Horn, which in both of these versions I'm listening to goes:
A, A going up F# F# F# G G #F E

the first movement from A to F# is a major sixth and the scale the theme is in is in A mixolydian (the flatted 7th - G)

It's a beautiful harmonization because the opening letimotif makes the whole thing feel really melancholy,
but the actual interval is major in the opening two notes of the them (a wonderful trick in writing from
the Impressionists that recontextualizes Major scales into melancholy sounding themes).

If this still doesn't doesn't jive with what you guys are hearing, let's exchange some .mp3 files and make sure we
are on the same page in terms of what we are actually listening to.. Importantly, what version are you listening to (and I even wonder, were there more than one Leia's theme in the Star Wars pantheon..........maybe we're listing to different movies.)

You all can go to this URL to hear what my wife and I are hearing. Send me an mp3 of what you are listening to if it differs and I'll put it up on the same page

www.looppool.info/LEIA's THEME from STAR WARS excerpt

by the way, it was my wife, who has a better intervallic ear than I do who heard that it was a major 6th.
I just accepted it as minor and she corrected me. The harmony faked me out.............great writing!!!