The Massachusetts Port Authority this week unveiled a $1.5 billion plan to renovate and expand Logan Airport, stimulate job growth in the Boston area, and ease regional congestion.

The "majority" of the $1.5 billion would be raised through tax-exempt issuance spaced out in small increments over the next 10 years, said Elizabeth Taylor, director of financial policy at the authority. The first sale will take place in 18 months to two years, she said.

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