Community Transit announced plans for a second Swift line in November 2013. The line, tentatively named "Swift II", was created out of two Transit Emphasis Corridors, and would travel from the Boeing Everett Factory to Mill Creek via Airport Road and State Route 527. A study, prepared by Parsons Brinckerhoff, and partially funded by the state legislature in 2012, estimated that the project would cost $42–48 million to construct, and attract 3,300 riders when it opened. The Federal Transit Administration approved project development in December 2014, a prerequisite to federal grants for capital construction and vehicle acquisition. During the 2015 session of the Washington State Legislature, Community Transit was granted the authority to increase sales taxes to fund operation of Swift II, pending voter approval via a ballot measure; the Washington State Department of Transportation also gave $6.8 million in funding to build the line's northern terminus at Seaway Transit Center. The ballot measure was approved by voters in November 2015, allowing for construction to begin sooner.