Airwalk's logo is a white tent in a red circle.
The company that has a red circle logo with a white R in it is Rossignol
target
Vodafone
The company that has a red circle logo with a red R in it is RadioShack.
Castelli
Rossignol
Camper
Vodafone is one company that has the red tear drop in a white circle. There are probably other companies that have a similar logo as well.
Vodafone
airwalk
levitz
Vodafone