Canadians who wish to apply for extensions while remaining in the US may file Form I-129 plus a $130 filing fee for the TN principal and I-539 plus $140 filing fee for family members (inclusive) with the Nebraska Service Center. Alternatively, TN principals and family members can depart the US and reapply for admission in TN and TD status. A charge of $6.00 will apply to each replacement Form I-94 required. TD family members traveling without TN principals extend their stays by applying at ports of re-entry with copies of the principal’s Form I-797.