Airline Site does not confrm 144hr free transit

We going to be travelling with British Airways soon and some sites state that you have to contact them direct before you arrive at your departing airport here in the UK. However trying to get an easy and quick answer from BA is virtually impossible and all their sites relating to Visa Waivers only give brief information on 72 hrs Free details.
So basically my question is ~ are you sure that all we have to do is highlight our intentions once there and 'boardng' with the airline?. We've read where passengers have been let down with their airlines over this issue. Maybe it has got better recently?