JetBlue’s newly expanded loyalty program saw “exceptional growth and engagement” during its first months.The program, TrueBlue, was expanded during the fourth quarter and has seen especially strong growth and engagement from the airline’s Mosaic customers, who have the highest level of TrueBlue membership, JetBlue said in a Tuesday (Jan. 30) earnings release.The more expansive TrueBlue program is part of JetBlue’s efforts to accelerate its innovation and continue improving the experience it offers the full ...