"Contact DataArchived 11 November 2011 at the Wayback Machine." Enter Air. Retrieved on 4 January 2011. "Enter Air Sp. z o.o. ul. 17 Stycznia 74, 02-146 Warszawa, Polska" – Polish addressArchived 19 January 2012 at the Wayback Machine: "Enter Air Sp. z o.o. ul. 17 Stycznia 74 02-146 Warszawa, Polska"
"Contact DataArchived 11 November 2011 at the Wayback Machine." Enter Air. Retrieved on 4 January 2011. "Enter Air Sp. z o.o. ul. 17 Stycznia 74, 02-146 Warszawa, Polska" – Polish addressArchived 19 January 2012 at the Wayback Machine: "Enter Air Sp. z o.o. ul. 17 Stycznia 74 02-146 Warszawa, Polska"