Early Arrival Late Checkout Trigger

Could a criteria to detect for early arrival / late check out be added for use in triggers?
Typical use would be that if a late check out has been agreed with a guest then we want to prevent an automated upsell email going out for something the guest already purchased.
Probably quite a few other uses as well.

You should be able to do this with tags (booking or customer) and then using the tag booking criteria on the trigger.

[This topic has been closed as a duplicate of another topic (Trigger Booking Field Criteria - Check In Check Out Non Standard Time)]