@nelasona, It was a TD extension petition. The problem I faced was my employer filed for TN and TD extension for myself and dependents in plenty of time, ( a few months prior to TD status expiring). We used normal processing so we should have had lots of time but Covid slowed everything down. So, the 240day/8 month window was getting too close and I booked a flight to Toronto to travel a couple of days prior to expiration. The night before I flew the I-129 was approved!