Restrictions: 3 X! q4 r5 l, I5 ?8 |. |7 j. V1 ]1 h1 N) d" NFor example, 100% non-refundable; non-changeable, but usually airlines allow you change date, but you need to pay change fee plus fare difference. Another is max.stay in China 1 month, or 6 months. or 3 months.