Every US and Canadian carrier on the site, from the big three and Southwest to regional operators that fly under another brand. Each page shows the carry-on size, personal item, checked allowance and bag fees as published on the airline’s own site, with the date it was last checked.Two things set this region apart. Carry-on limits are stated as a box size with no weight cap on most carriers, and the cheapest fares on ultra low cost airlines include only a personal item. Regional operators such as Envoy, SkyWest and Endeavor publish no allowance of their own, so their pages explain whose rules govern the ticket.