Although concrete pavement is not new to John F. Kennedy International Airport, LaGuardia Airport, or Newark International Airport, recent taxiway and apron paving projects have seen a dramatic increase in its use. Reasons for the growing use of concrete in airport pavements include: * Recent developments in concrete mix design, such as the use of steel fiber, superplasticizers, fly ash, and rapid-setting cements, make high-quality concrete easier to achieve. * Favorable bid prices have made the initial cost of concrete pavement comparable to that of flexible pavement. Life-cycle cost analysis show concrete pavement to be significantly more economical than flexible pavement. * Creative construction staging plans prepared by Port Authority staff, in cooperation with the FAA and the ATA, give contractors the time and staging area necessary to place and cure concrete pavement. * A new "end-result" paving specification, based on FAA requirements, has improved quality. Contractor payment is related to the percent of pavement that meets or exceeds limits for flexural strength and thickness.