JetBlue is joining the industry’s race for premium-paying travelers, rolling out first class seating on domestic flights this fall. The low-cost carrier from Queens is calling it BlueFirst, featuring seats designed by the mattress maker Tuft & Needle with up to seven inches more legroom and five inches more recline than JetBlue’s regular seats. “We think it’s time for a fresh take,” JetBlue CEO Joanna Geraghty said.