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The worst you can do when you arrive in Berlin TXL airport is, to take a taxi. The majorities of cabbies waiting at the airport is questionable. I have had out of a 100 transports ZERO at correct prices / shortest way. Some are just driving a small deviation, others bigger. All like to cheat you with the luggage (no, it is included) and many don’t know even where to go. Always ugly discussions. Often the cars are dirty too. Not recommendable.