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WASHINGTON, April 5 (Reuters) – JetBlue Airways (JBLU.O) said Tuesday it made an unsolicited $3.6 billion bid for Spirit Airlines (SAVE.N), potentially snarling merger plans between the ultra-low-cost carrier and Frontier Group Holdings (ULCC.O). JetBlue Chief Executive Officer Robin Hayes said the deal would make the New York-based airline a stronger competitor to the so-called four legacy U.S. airlines that control nearly 80% of the U.S. passenger market. JetBlue, the sixth-largest U.S. passenger carrier, would operate Spirit under the JetBlue brand and he does not think any divestitures are needed. The move comes as airlines face higher fuel and labor costs, and work to…