1. 
   LTA
   abbreviation: Lighter than air
   Found op http://www.apscharts.com/abbrev.html
   
   
2. 
   LTA
   Low Temperature Aftercooling
   Found op http://www3.sympatico.ca/dhaughey/j1930.htm
   
   
3. 
   LTA
   Lighter-than-air craft, generally referring to powered blimps and dirigibles, but often also includes free balloons.
   Found op http://www.aerofiles.com/glossary.html
   
   
4. 
   lta
   1) Abbreviation
   Found op lighter than air 2) Like balloons
   
   

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