"do these airports have any commercial value" ?
offcourse dear. Most of them are commercial airports as well connecting all the other airports in the north east and rest of india. Well commercial value has been in plenty ever since after WW2 . After independence until a long time people prefered to travel within assam in shuttle flights since roads were poor and Oil is in plenty.
As far as future commercial value is concerned, if indias look east policy goes on well, you can imagine their value. south china, taiwan, thailand, burma, combodia all within 0.5-2 hrs reach.
Assam has the unique locational advantage of being situated close to South East Asian countries, blessed with rich fertile land where almost anything and everything can be grown. It provides a strategic base for foreign and domestic investors to tap the vast potential of contiguous markets of Myanmar, Malaysia, Thailand, Philippines, Cambodia, Indonesia, etc. Besides, Assam's proximity to the countries like Bangladesh, Nepal and Bhutan attracts more and more foreign investors into the State. Assam's internal waterway network, connecting the State to Bangladesh, gives access to the ports of Chittagong (Bangladesh), Kolkata and Haldia (West Bengal).
No wonder Thailand has already started visiting to start investment in assam and use its fertile land to produce cheap agricultural products and export to rest of SE asia.