What is Date, when Comment is Tailcone On, Lakebed Landing, and when Duration is 5min 34 s?
CREATE TABLE "list_of_alt_flights" (
  "test_flight" text,
  "date" text,
  "speed" text,
  "altitude" text,
  "crew" text,
  "duration" text,
  "comment" text
);
SELECT "date" FROM "list_of_alt_flights" WHERE "comment"='tailcone on, lakebed landing' AND "duration"='5min 34 s';