As noted in the "Money Matters" document, a traveler who is registering for the trip has choice of paying for "Land-Only" arrangements through the Organizing Team, or of taking the "full package" which includes airline arrangements.
The ACO Dress Code has been established over the years to ensure that our choir members are dressed in line with the customs adopted by the churches and cathedrals that we visit in the course of our travels in Europe and the U.K. In some cases, these norms may be rather more formal than we are used to in our churches here in Canada, but they must be observed by ACO members.