It is possible that the crew were not from Sunwing, if flight tracker is accurate this may have been a WetLease operation.
Flight Tracker is showing this flight as being operated by Thomson airways... , who were granted authority to operate some flights for SunWing under:
https://www.otc-cta.gc.ca/eng/ruling/333-a-2016
Flight Tracker Data
Flight Details
View track log/graph · Track inbound plane
Departure Times
Gate Departure
Taxiing
Takeoff
Actual
01:02PM CST36 minutes
01:38PM CST
Scheduled
10:15AM CST
10:15AM CST
Arrival Times
06:58PM EST
Aircraft information
Owner
Thomsonfly.com
Aircraft Type
Boeing 737-800 (twin-jet) (B738) Photos
Airline information
Airline
Sunwing "Sunwing" all flights