Originally Posted by HkCaGu

If it is American Eagle/SkyWest, it is already going to be Eagle's Nest (Gates 52). If buses to T4 and T5 are different, take the T4.

Originally Posted by bzcat

If the arriving flight is operated by Skywest, it will use the remote terminal aka "Eagle's Nest". Instead of taking the shuttle bus to Terminal 5, they should just take the shuttle bus to Terminal 4. Flagship lounge in T4 is a short walk upstairs from the T4 bus gate.

I personally prefer the Flagship lounge over OneWorld lounge in TBIT but both are fine.

Originally Posted by JJeffrey

OP said their family member doesn't have Flagship Lounge access.