The B6 mark is "jetBlue" and is displayed on all the B6 tails as well as on the fuselage. Note, they are the same mark.
Conceded. Which doesn't change the original argument in any way.
The original argument was: Can an airline logo be successful even when the logo, or a significant chunk of the logo, is not entirely contained on the tail? I think so. Others seem to feel that the tail is the primary logo "home" for airlines. <shrugs>