The airlines said that more than 98.6% of shareholders voted, and 77.5% voted in favour of the sale.
The deal would allow Southwest to operate flights to Atlanta, and routes to Mexico and the Caribbean.
AirTran and Southwest had previously announced the proposed merger in September. The companies still need clearance on the proposed merger from the US Department of Justice, but anticipate closing the deal by the second quarter of this year.
Until the acquisition is approved and finalised, both carriers will continue to operate independently.
Latest from Aerospace Manufacturing and Design
- Trelleborg acquires Aero-Plastics
- Industrial automation products, enclosed encoders
- #61 - Manufacturing Matters: CMMC roll out: When do I need to comply?
- AIX shows aircraft interiors are a strategic priority for global airlines
- Machine Tool Builders Roundtable: Turn equipment into expertise
- No time to waste: How to machine MedTech parts more efficiently
- The 5 Best and Fastest Spindle Repair Services
- Mill smarter, not harder: How collaboration optimizes production
