I fly A220 routes a lot, and now have had swaps for a B717 and A320. And seeing E170s back on routes for future bookings that were being fully serviced by A220.

Is the fleet tight in terms of routes being covered (deliveries slower) and Delta is spreading it out? Or are some planes being taken out of service for repairs. I’ve also had four (long) mechanical delays since the A220 has entered service.