What should I use to convert FLAC files to AIFF?

I think dBpoweramp can do that.

Sounds like it can - $39.00 isn't a bad price, either.
I'll definitely check it out.Thanks!

XLD  - Free

+1 for XLD. Save your money.

Freemake works and is "free"

I too use XLD.

Thank you all! I’m trying out XLD as I write.

@sc0ttc00ter   I recently started using https://www.freac.org/ for batch-converting to AAC format (for the car), but it converts anything to anything and I like always free programs (continuous builds).  I still use XLD for ripping CDs.

I've been happy with XLD for many years. Cheers,
Spencer

+ 1 for XLD

Consider converting from FLAC to ALAC (Apple Lossless). About the same file size. 

I convert to lossless AIFF files in my home system because the storage is cheaper. The file size of AIFF is much larger than the equivalent FLAC or ALAC conversion. Mobile storage (SSD?) might be more expensive and/or hold fewer AIFF files than their ALAC equivalents. 

Good luck.

T.