As described here JetBlue will extend the expiration of Travel Bank credits upon request:
I pinged them on Twitter DM (@JetBlue) and within 10 minutes I got an email alerting me that any Travel Bank credits expiring between now and 9/29/22 were updated to instead expire on 10/1/22. WIth JetBlue Travel Bank credits travel needs to be booked by this date, and their schedule is now bookable 11 months out. So this provides some welcomed time to make use of credits.
JetBlue has been getting dunked on lately since being named worst airline by the Wall Street Journal. In my experience JetBlue has some operational issues and their IT isn’t the greatest. But to call them the worst airline seems like an overstatement to me.