No. Assess the current facts and actual permission. Earlier entries do not authorize changed duties or guarantee a future decision.
Check the work as well as the travel date
Identify any new employer, changed activity or relevant status issue before relying on the next booking. A familiar itinerary is not proof that the underlying professional arrangement remains unchanged.
If the employer, duties, or client assignment changes, request a fresh assessment rather than assuming the original plan still applies, and remember that a temporary TN offer does not remove the need to consider longer-term intent. Sequence preparation from the employer's genuine start need backward: confirm citizenship, classify the occupation, test its minimum credential, obtain the letter or contract, and only then choose travel or Form I-129. An in-person application at a land border or preclearance facility produces a same-day answer with no visa required; an employer petition on Form I-129 takes longer but leaves a written record and a decision that can be reviewed before anyone travels or resigns. TN is granted for a period not exceeding three years and can be extended or a new admission sought, but each renewal is decided on the duties as they then stand, which on a long construction project are rarely the duties described at the outset.