yeah 25% bonus miles for Skymiles SL.but what for?

Getting an award ticket for DL nowadays will cost you lots of skymiles compared to two years ago...

And to just get those priority check in or boarding, you have to fly 25K miles on any miles earning skyteam member airlines a year.. compared to just 4 sectors (or even none) for CX GR Marco Polo members..

And the free check in baggage and free complimentary upgrades in DL only works for US domestic flights