Subsidizing Big Mac consumption would be a more effective way to provide jobs for the temporarily unemployed than subsidizing airport renovation.
From an excellent article on what infrastructure spending can and cannot do by Ed Glaeser.
Here’s another two:
Recovery Act transportation aid was twice as generous, on a per-capita basis, to the ten least dense states than it was to the ten densest states, even though higher-density areas need more expensive infrastructure (retrofitting New York with tunnels and bridges, for example, is far costlier than building in the greenfields of the West). Low-density areas are remarkably well-endowed with senators per capita, of course, and they unsurprisingly get a disproportionate share of spending from any nationwide program.