oolala11 i agree with you, i think it's not possible to change logo because the "data base" of the vtc will often change.
About the competition, i have an idea in order to keep good relationship , if a VTC can't make a travel, this VTC will pay an another VTC for this (developping the caring between vtc). But the first companies have to win advantages to did this..
With the competition, different ways to manage, differents specializations of vtc ..