Under the American Competitiveness in the Twenty-First Century Act of 2000 (AC21), a foreign national who has an approved I-140 petition and whose Adjustment of Status application has been filed and has remained unadjudicated for 180 days or more may accept a job with a new employer, or accept a different job with the same employer, as long as the new job is in the same or a similar occupational classification as the job for which the I-140 petition was originally filed.  This ability to move between the same or similar positions is referred to “portability.”