The Massachusetts Port Authority said that it is proposing to raise parking rates at Logan International Airport as a way to finance infrastructure improvements.

Currently, a person pays $27 to park a vehicle for 24 hours at the airport’s central garages. Under the new proposal, that amount would be increased to either $29 or $30 and to a maximum $20 or $21 a day in the Economy Lot, Massport said.

If approved by Massport’s board, the per day rate changes could go into effect July 1, Massport said.

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In order to reduce congestion at the curbs of terminals, the first hour rate will not change from $6, but under the proposal, subsequent hourly rates would rise.

According to Massport, parking rates were last raised in 2012.

In a statement, Massport chief executive Thomas P. Glynn said: “Logan has the highest rate of mass transit and high occupancy vehicle access of any airport in the nation, but we must continue to improve that. The costs of operating our garages continues to rise, and we are building a $30 million Logan Express parking garage in Framingham, which will double the number of available spaces for the suburban bus service, we continue to support the free Silver Line service inbound to the city from Logan, and we will be rolling out a shuttle bus from the Back Bay to Logan later this spring. These important programs will be supported by the parking increase.”