US carrier JetBlue launches hostile takeover of Spirit Airlines
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JetBlue called the antitrust concerns a "smokescreen" and said the deal with Frontier will face similar regulatory scrutiny.
"The Spirit Board of Directors has failed to act in the best interests of their shareholders by refusing to engage constructively on our clearly superior proposal," he said.
"JetBlue offers more value -- a significant premium in cash -- more certainty, and more benefits for all stakeholders," Hayes said.
"We are confident we can address any regulatory concerns the Spirit Board, regulators or courts may have."
Asked about the competing deals, US Transportation Secretary Pete Buttigieg said competition in the industry is critical.
It "needs to be demonstrated that this would not have a negative effect on competition in order to meet those legal hurdles," he said on CNBC.
Amid growing concentration in the airline sector, he said it is up to the Justice Department do decide "where you draw the line."
In early February, budget carriers Spirit and Frontier announced they were combining to create a competitive low-cost carrier that aims to test the dominance of larger rivals.
The merger would create the nation's fifth-largest airline by seat capacity, behind American, United, Delta and Southwest.
But in April, JetBlue challenged the deal, offering a similar argument about challenging larger US carriers.