You will certainly standout in the Boarding line.
Will you be seen in public with it in tow?
Is the 28" considered on a Carryon?
To say the least, you will never need a flare at night if you break down, just take your luggage out of the trunk and put it 20 feet behind the car!! The 28" is not considered a carry on but it is sure to never be left behind on a plane!