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A Spirit Airlines aircraft takes off at Orlando International Airport.

Check out the companies making headlines in midday trading.

Frontier Group, Spirit Airlines — Shares of Frontier Group and Spirit Airlines rose in midday trading after the companies announced they are merging in a deal valued at $6.6 billion. The two largest low-cost airlines will create what would become the fifth-largest airline in the country. Spirit Airlines surged 17.2% and Frontier Group rose 3.5%.

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