| Business | Phone |
| Flight Director Inc 100 Michael Angelo Way 600-, Austin 78728 | (512) 834-2000 |
| Castleberry Instruments 817 W Howard Ln, Austin 78753 | (512) 251-5322 |
| Aviation Depot Inc 8408 Axis Dr, Austin 78749 | (512) 474-5000 |
| Dac Intl Inc 6702 Mcneil Dr, Austin 78729 | (512) 331-5323 |