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Welcome to FT, mitkaese.

Using BA miles for TATL Coach travel is generally a poor idea because of high fuel surcharges imposed on the TATL segments; better to use those miles for AA flights to Hawaii, the Caribbean, Asia, South America, etc.

Getting a "cheap" TATL award ticket on DL might prove very challenging.

You can convert 25,000 SPG points to 30,000 AA miles, which would be enough for a one-way MileSAAver award to or from Europe. From upstate NY (SYR, ROC, BUF, and maybe even ART by this summer) the routing would be through ORD. From there, AA offers nonstops to several European cities, and AA partner IB offers a nonstop to MAD, with connections available there to other European destinations. You also could make your way down to NYC to catch TATL flights on AA, AY (to Helsinki and beyond), 9W (to Brussels), or IB (to Madrid and beyond).

For the other one-way, you could convert 30,000 Amex MR points to 30,000 AC Aeroplan miles. AC also offers one-way awards to or from Europe, but I believe that the one-way awards are only valid on AC metal, so you would have to get yourself to or from a city served by AC, like NYC, YYZ, YOW, or YUL.

You can easily check for award seat availability on AA metal on aa.com; to check availability on AA partner carriers, you would have to call AA. I'm not sure if AC lets you check award availability on their site, but that should be easy enough to determine.

Whatever you do, don't transfer/convert any miles until you know that there is award-seat availability. Good luck.