You do not worry take longer time to travel Tibet, now you can take short time for travel to Tibet. Now there are more airports in Tibet, such as in Lhasa, Shigatse, Nyingchi, Chamdo, and Ngari. Furthermore by train from China to Lhasa, and also train to Shigatse.
However, like anything else, there are two aspects in the well developing facility. On one hand, the Shigatse, Chamdo, Nyingchi, and Ngari airports provide much more convenient transfers from Lhasa city, capital of Tibet, and also from outside of Tibet, to local people more easily connecting to the outside of the world, and to the tourists more easily getting to the corners of where before hard to get to as well.
Thus, bad for adventures but good to local people and sightseeing tourists.
Nowadays, people can go to Shigatse from any chinese cities easily, within two hours and half rather than before, having to take buses in 5 to 6 hours besides the two hours flight. Also, people spend four hours from Chengdu to Ngari, or two hours from Lhasa to Ngari, but before people spent more than two days to get to Ngari.
The new flight routes are listed below:
1. All chinese cities fly to Shigatse and back
2. All Chinese cities fly to Ngari and back
3. All Chinese cities fly to Nyingchi and back
4. All Chinese cities fly to Chamdo and back
5. Lhasa fly to Nyingchi fly and back
6. Lhasa fly to Chamdo and back
7. Lhasa fly to any cities in Tibet and back
Therefore, for instance if you travel to Tibet nowadays within 4 days including Lhasa and Shigatse, you can now fly to Lhasa first and stay there for two nights. On the third night you stay in Shiagtse. But on the fourth day you can fly out of Tibet directly from Shigatse, no need to drive 5-6 hours back to Lhasa and take the flight.