House committee substitute makes the following changes to the 1st edition.

Modifies proposed GS 63-74, which establishes an Airport Improvement Program (program). Now requires the biennial economic impact study to be conducted by the Department of Transportation (DOT) to look at the annual economic impact of each commercial service airport in the state (previously, each commercial and general aviation airport in the state), with funds appropriated to the program to be disbursed based on the percentage of the total economic impact of each eligible airport, as previously specified. Modifies the parameters for the distribution of program funds, now requiring the three largest airports, as defined by economic impact, to take a 5% cut per decile of the pro rata share of funds distributed, with a maximum cut of 20% (previously, limited the distribution of funds to the three largest airports, as defined by the total number of passenger boardings used to determine program eligibility, to no more than 80% of the total program funds). Maintains the distribution requirements for the remaining funds to remaining eligible airports previously provided.