Title explains it all... Trying to use my $100 eCert from a while back, while at the same time using my mom's companion cert. I skimmed through the companion cert info page on dl.com and didn't see any restrictions against it. I know how to enter multiple certificates when trying to book something but didn't know if it was possible to use the $100 eCert and the companion cert for the same PNR.. Thanks for the help.