I've been flying out of ABE for years & years it was never free when I parked! Even the economy lot was $6/day years ago. You can park free in the little lot while waiting to pick someone up as long as they're not checking meters. I use that little lot several times a year when waiting to pick up DH & have never seen them checking meters. But then again, the lot has never even been 1/2 full. If you had free overnight parking in the past at ABE it may have been part of some promo with the airline or hotel maybe?