CREATE TABLE "list_of_alt_flights" (
  "test_flight" text,
  "date" text,
  "speed" text,
  "altitude" text,
  "crew" text,
  "duration" text,
  "comment" text
);

Question: What is Duration, when Test Flight is Taxi Test #2?
SQL: SELECT "duration" FROM "list_of_alt_flights" WHERE "test_flight"='taxi test #2';

Question: What it Duration, when Test Flight is Free Flight #3?
SQL: SELECT "duration" FROM "list_of_alt_flights" WHERE "test_flight"='free flight #3';

Question: What is Date, when Comment is Tailcone On, Lakebed Landing, and when Duration is 5min 34 s?
SQL: SELECT "date" FROM "list_of_alt_flights" WHERE "comment"='tailcone on, lakebed landing' AND "duration"='5min 34 s';

Question: What is Crew, when Date is July 26, 1977?
SQL: SELECT "crew" FROM "list_of_alt_flights" WHERE "date"='july 26, 1977';