SELECT "Air Date" FROM table_75835 WHERE "18\u201349" > '1.9' AND "Viewers" < '7.54' AND "Rating" < '4.9'
What is the Air Date that has a 18 49 larger than 1.9, less than 7.54 viewers and a rating less than 4.9?
CREATE TABLE table_75835 (
    "Episode #" real,
    "Title" text,
    "Air Date" text,
    "Rating" real,
    "Share" real,
    "18\u201349" real,
    "Viewers" real,
    "Rank" text
)