Treat the date as provisional until the actual permission and required steps are understood. A booked trip does not establish work authorization.
Explain changed plans
If duties or employer arrangements change, review the real proposal. Do not rely on a familiar travel pattern to cover different work.
Allow time to prepare the second employer's duty letter and evidence, confirm compatibility with the first role, and complete the correct authorization step before that work begins. A hiring deadline does not establish direct professional support or authorize work, and a generic letter should not substitute for facts the employer has not decided. Canadian citizens may request TN classification at a port of entry or use an employer-filed Form I-129; neither option lets the project schedule confer work authorization. The passport must be in hand before travel is booked; the letter and credential evidence must match the passport that will actually be presented; the admission record must be checked once entry has happened. The immigration step can often be completed relatively quickly once the qualification documents and the employer's letter exist, and it should be scheduled behind the licence.