2. A person acts as travel agent when he carries on a commercial activity in which he performs or offers or attempts to perform on account of others any operation in the following list:
(a) the reservation of lodging accommodations and the issue of lodging vouchers, except by a hotel-keeper, and the booking, except by a carrier, of passage on any means of transport or the issue of passenger tickets;
(b) the organization of individual or group travel by contract or for a commission, or the sale and provision of tickets and vouchers for such travel.
Every association, partnership or corporation performing, on account of its members, any operation mentioned in subparagraphs a and b is also a travel agent for the purposes of this act.