Today I will explain fifth freedom flights for Druk Air(KB).
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About KB

Druk Air(KB) is the flag carrier of the Kingdom of Bhutan.

Official page

Frequent Flyer Programme of KB

Frequent Flyer Programme of KB, called “My Happiness Reward”, is very limited use, I think it is needed to become real “Frequent Flyer” to get their benefits.

PBH – CCU – BKK

CCU BKK(1009 miles)
KB120/121

PBH – IXB – BKK

IXB BKK(1198 miles)
KB130/131

PBH – GAU – BKK

IXB BKK(1041 miles)
KB140/141

PBH – KTM – DEL

KTM DEL(507 miles)
KB240/241

PBH – CCU – SIN

CCU SIN(1804 miles)
KB500/501

Conclusion

Apparently None of them cannot buy only the fifth freedom flight route only.

At Bhutan, lots of workers from India and Nepal come and work there, that will be one of reasons.