One way flt from STL to LAX

(June 22 around noon) Flight 5478 going through XNA (Fayetteville) Flt 3118 on to LAX. On AA it is pricing out at $1,003

Using Studentuniverse.com the exact same itinerary is pricing out at $153.21.

Do you think this would qualify for the low price guarantee?

If I book this as a rt from LAX to STL to LAX the fare is still way higher on AA. For some reason studentuniverse.com can get that XNA routing at a much lower cost.

Thoughts?

Thanks