With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: It was a milestone in aviation history : the first Airbus A380 landed at Singapore 's Changi International Airport at 6:40 p.m. ( GMT +8 ) after a 12-hour flight from Airbus ' Delivery Center .
text_B: The being did not happen
not-entailed.