Q: For how many days air travel should be avoided after resolution of pneumothorax?

Answer:

Air travel should be avoided for up to 7 days after complete resolution of a pneumothorax. Some guidelines even prefer to wait for 2 weeks. A followup CXR should be obtained prior to travel to confirm resolution of pneumothorax.

Reference: 

1. MacDuff A, Arnold A, Harvey J, BTS Pleural Disease Guideline Group (December 2010). "Management of spontaneous pneumothorax: British Thoracic Society pleural disease guideline 2010". Thorax 65 (8): ii18–ii31

2. Practice Guideline, Orlando Regional Medical Center. Air travel following traumatic pneumothorax. October 2009.