; (B) performance based navigation; (C) surface operations and data sharing; and (D) data communications; and (5) develop a detailed plan to mitigate the risks identified under paragraph (4); and (6) submit to the appropriate committees of Congress a report on the activities under paragraphs (1) through (5), including the plan. 4117. System-wide improvements (a) In general Not later than 1 year after the date of enactment of this Act, the Administrator shall submit to the appropriate committees of Congress a report identifying any improvements and benefits to the national airspace system, as a whole, as a result of— (1) multiple runway operations; (2) performance based navigation; (3) surface operations and data sharing; and (4) data communications. (b) Considerations In identifying improvements and benefits under subsection (a) as a result of the NextGen programs listed under subparagraphs (A) through (D) of that subsection, the Administrator shall consider, at a minimum— (1) reduced overall delays in the national airspace system; (2) increased overall throughput in the national airspace system; (3) decreased overall emissions and fuel consumption in the national airspace system; and (4) improved safety in the national airspace system. 4118. NextGen research Not later than 1 year after the date of enactment of this Act, the Administrator shall submit to the appropriate committees of Congress a report specifying the top 5 priority research areas for the implementation and advancement of NextGen, including— (1) an assessment of why the research areas are a priority for the implementation and advancement of NextGen; (2) an identification of the other Federal agencies and private organizations assisting the Administration with the research