OK dh has full custody. Ss15 is supposed to go to visit hcbm on holiday breaks. Christmas break says 7 days. Does this include travel?

We pay for the flights because she didn't want to, so it was our interpretation that we choose the flights and notify her and that the flights can occur on her days just as travel would occur on any other day if we lived a city a part. What is the correct reading of this? Again it is vague.