Check out the companies making headlines in midday trading. JetBlue Airways — The airline said it sees a smaller decline in its full-year revenue guidance than it originally expected, according to a regulatory filing . Higher-than-anticipated bookings in November and December resulted in JetBlue boosting its forecast. Shares surged 8%. Roku — Shares jumped 11% after Needham analyst Laura Martin said the streaming company will likely be bought for a “large premium” over the next year as…