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Aol is the company who's logo you described.
Aol
AOL - previously known as America Online
Allianz,
AL-ANON And a mathmatical symbol
Hilton
The Expedia logo has a blue circle and yellow airplane.
The logo with a blue triangle and yellow c and mermaid is Cressi.
The company Garmin has a blue triangle in its logo, with the triangle over the 'N' in the 'IN' of the Garmin name.
The Fairtrade logo represents the blue as the sky the green as the grass and if you can see there is a guy waving (the black circle is his head and the middle of the green and the blue is him waving)
Evian
The company logo with a blue square and white G is for Gap. Gap is an American retail company founded in 1969.