Table: jets_87_season
Columns: week
date
opponent
result
game_site
attendance

Question: Who did the Jets play in their post-week 15 game?
SQL: SELECT "opponent" FROM jets_87_season WHERE "week" > 15

Question: Who did the Jets play in their pre-week 9 game at the Robert F. Kennedy memorial stadium?
SQL: SELECT "opponent" FROM jets_87_season WHERE "week" < 9 AND "game_site" = 'robert f. kennedy memorial stadium'