Three of the airports are in Mato Grosso state and another three in Rio de Janeiro.
A December bidding round was delayed due to uncertainty surrounding the presidential impeachment proceedings scheduled for December 21.
The project entailed the construction of 1.7km of exclusive lanes for public transportation, as part of a wider program aimed at implementing 13.7km of similar public transport corridors.
The probe is part of the massive Lava Jato operation.
The US$28mn project is part of a wider program aimed to improve the connectivity of the western Chocó department.
The budget execution level is the highest for 10 years, according to authorities.
BNamericas takes a look at major projects in President Peña Nieto's portfolio that are currently racing against the clock to be completed before the end of his government term.