Dear friend, welcome and thanks for entrusting your query here at HCM!
I am Dr. Prasad Akole (Critical Care Expert- http://bit.ly/Dr-Prasad-Akole) and am glad to address to your query here.
The Xray reports over inflated lung fields- emphysema
It is found in diseases like bronchitis
, emphysema etc.
However, it needs to be interpreted with clinical examination as normal lungs with a deep breath may also mimic it.
It definitely does not suggest any TB or tumour.
Clearance for travel should not be a problem. And you say he has no symptoms or respiratory problems and is non- smoker.
Please take opinion of your physician to know if it indicates anything or he had any chest signs.
I see no worry.
I hope you are fully satisfied with the guidance I gave.
I would be glad to answer any further queries. May I request you to rate your experience here before you close.
Thank you and Good luck!