I can't think of any Regional Jet or larger that would be approved for a zero flap takeoff.
Flaps are a checklist item, but normally they're lowered as part of a cockpit "flow" beforehand and then checked during the reading of the Checklist. They may have caught the flaps being out of position while performing the checklist.
Ultimately, however, the aircraft will issue a multi-tiered warning with a loud chime, flashing red lights, and a specific TO CONFIG message presented for the crew if they bring the thrust levers up to a high thrust (ie - takeoff) position if the flaps, trim, spoilers, brakes, etc. are not set properly for takeoff.
These warnings came about as a result of the accidents you mentioned.
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