CREATE TABLE table_203_340 (id DECIMAL, "rank" DECIMAL, "airport" TEXT, "passengers handled" DECIMAL, "% change 2011 / 12" DECIMAL)

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 ?
SELECT "airport" FROM table_203_340 WHERE "airport" = 'portugal'
SELECT "airport" FROM "table_203_340" WHERE "airport" = 'portugal'