I've called American Airlines Credit Union (CU), they say you have to be an employee there to get a cheaper rate.
So these are some CU rates that I've found online if anyone interested.
Texas Health Resources Credit Union 2.5% for 60 months, but you have to open a checking account with $20 deposit and one time $25 application fee.
City Credit CU 1.99% for 36 months, not sure of the terms for that.
TDECU 2.99% for 48 months
Lone Start CU 2.75%, no info on term
Neiman Marcus CU 1.90%, for employee
Baptist CU 2.5%, for members I believe
Those are the one I've found. Hope that help.