Bluescan -
xxx
Best glide speed obviously lower for a 737 than a 747.
I hate to give uneducated numbers, but certainly could be 160-180 KIAS.
Wish airliners had an "angle of attack" indicator. Learjets have one.
With such instrument, you do not even worry about approach speeds.
Heavy or light, fly the attitude...!
xxx
Happy contrails