Spirit shareholders will vote on the future of the airline this week during a special meeting on June 10, 2022. If shareholders vote against the Frontier merger, that would open the door for the JetBlue proposal to be addressed by Spirit's board. While Spirit's board has been telling shareholders to vote in favor of the Frontier merger, the Institutional Shareholder Services (ISS), a prominent shareholder advisory firm, last week said that Spirit's investors would make more money, and have more choice, with the JetBlue deal, even though it may face more regulatory scrutiny.