Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 120
ATC Issue All Types; Conflict Airborne Conflict
Flight Crew FLC complied w / Automation / Advisory; Flight Crew Returned To Clearance
Procedure; Staffing; Human Factors; Airspace Structure
While descending out of 6;000 ft for 4;000 ft; we noticed an aircraft that appeared close to our altitude but slightly lower and appeared to be climbing. I made sure all of our outside lights were illuminated including turning on our landing lights. We then received a TCAS TA alert of proximity and almost at the same time as this received a Traffic Alert 'Climb 6;000 ft and turn 15 degrees right' command from ATC (Approach Control). I then saw the other aircraft turn on his landing light in response to seeing me turn on mine; which told me that he probably saw us too. Shortly thereafter we received a level off command;(RA alert) at which time we did level off. I saw the aircraft passing behind us and returned to the STAR immediately after knowing we would be clear of the conflict. STAR arrival this low and close to such a busy airport should be better protected. Maybe expand the airspace around Austin Airport as it is very busy. I also feel that our air traffic controllers are way over worked and facilities undermanned. ATC does a fantastic job considering but we are expecting too much from these controllers and it will put aircraft and lives at greater risk.
Air carrier Captain reported an airborne conflict with another aircraft while descending on arrival into AUS and suggested that the STAR airspace should be better protected.