the best season to have this program is between May and October,
there are several
flights every day from Beijing to Xi¡¯an
there are several
flights every day from Xi¡¯an to Lanzhou
there is at
least one l flight every day from Dunhuang to Urumqi
there are several
flights every day from Lanzhou to Dunhuang
the Tuogart
Pass is not open on Saturday, Sunday and all the Chinese holidays
 £ £ £ £ £ £ 
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