I have split the border airspace into two more manageable pieces, one
for California/Arizona/New Mexico, the other for Texas (which is a
whole nuther country anyway):

SUA:
http://www.justsoar.com/public/sua/ca_az_nm_mexico.sua
http://www.justsoar.com/public/sua/tx_mexico.sua

OpenAir:
http://www.justsoar.com/public/opena..._nm_mexico.txt
http://www.justsoar.com/public/openair/tx_mexico.txt