1. Aer Lingus
This Irish airline operates mainly in Europe and Africa and operates a wide variety of single aisle A319s, A320s and A321s. The company has both short haul and long haul flights and it has a long history. It was first stated by the Irish government in 1936 before later converting itself to a low cost carrier in 2001. The company has got 7 out of 7 stars in terms of safety ratings and 4 out of 5 stars in the product category.
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