what is the name of the only airport in portugal that is among the 10 busiest routes to and from london southend airport in 2012 ?
CREATE TABLE table_203_340 (
    id number,
    "rank" number,
    "airport" text,
    "passengers handled" number,
    "% change 2011 / 12" number
)
SELECT "airport" FROM table_203_340 WHERE "airport" = 'portugal'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: what is the name of the only airport in portugal that is among the 10 busiest routes to and from london southend airport in 2012 ? ### Input: CREATE TABLE table_203_340 (
    id number,
    "rank" number,
    "airport" text,
    "passengers handled" number,
    "% change 2011 / 12" number
) ### Response: SELECT "airport" FROM table_203_340 WHERE "airport" = 'portugal'