I recall reading about plane flights on the Lord's Day into this island on the BBC web site awhile back and was surprised and glad there was a place trying to keep the sabbath, especially in Europe- it is so rare.
No doubt many will not understand this, even many Christians. But the intention is right- ordinarily, nonessential travel should also rest on the Lord's Day for the people who work in that. While these kinds of details can sometimes be difficult to apply and be certain of biblically, the intention is right and this provides great benefit to a community that rests.