and to other equipped aircraft. (5) NextGen The term NextGen means the Next Generation Air Transportation System. A NextGen air transportation system 4101. Return on investment report (a) In general Not later than 1 year after the date of enactment of this Act, and annually thereafter until the date that each NextGen program has a positive return on investment, the Administrator shall submit to the appropriate committees of Congress a report on the status of each NextGen program, including the most recent NextGen priority list under subsection (c). (b) Contents The report under subsection (a) shall include, for each NextGen program— (1) an estimate of the date the program will have a positive return on investment