Here's a link to the Monarch scheduled
Menu Page giving details of what will be available for purchase.
My parents use ZB quite frequently to/from their Spanish home, and will probably continue to do so. Monarch get them there safely, affordably, usually on time and with a minimum of fuss, but without all the loco aspects of FR/EZ that can make flying so unpleasant. I've found ZB to be a fairly slick operation.