Air Baltic will sell you a 737 rating for €9900.
...on a -500, now rated a Classic. 1000 more and you get NGs. With one of the worse TRTO in EU, probably paired with a former-CCCP military guy as TC.
Including landings etc.
I don't think so, that is another 6-7K. And then you are out on your own...no hours on type.
DK
