Transportation Security Administration Target Service Agent Training Support Agency Technical Support Activity Training Situation Analysis Tax Sheltered Annuity Theater Storage Area Training Support Agent Technical Systems Audit thermal swing adsorption Time Series Analysis Time Slot Assignment Tourism Satellite Account Transuranic storage area Tapered-Slot Antenna Taxiway Safety Area Technical Support Alliance technical surgical assistance Technology Student Association Telecommunications System Architecture Telephony Services Architecture Temperature Swing Absorption Temperature-Swing Adsorption Temporary Segregated Airspace Test Start Approval Thorax Side Airbag Time Slot Allocation Time Stamping Authority toluene sulfonic acid Tool Stowage Assembly