Simplify the following text for a Grade 11 native English-speaking person.
Original: Northwest also operates flights from a small hub in Asia at Narita International Airport near Tokyo and also operates transatlantic flights in cooperation with partner KLM from Schiphol Airport in Amsterdam .
Simplified: Northwest also operated flights from its Asian hub at Narita International Airport ( Tokyo ) . Transatlantic flights were operated from its European hub at Amsterdam Airport Schiphol in cooperation with its partner airline KLM .