What does ATBA stand for?

Absolute Time Base Accuracy (SAUS)

All Terrain Boarding Association (FLAA)

American Transportation Bowling Association (EA)

American Truckers Benevolent Association - Defunct (EA)

Arizona Thoroughbred Breeders Association (SRA)

Association of Theatre Benefit Agents - Defunct (EA)

Automatic Test Break and Access - Telecommunications (TEL)