Change/redeposit fees continue to be waived for all but Basic Economy awards (which are 9900 miles domestic, 19900 miles international). Although there are no partner Basic Economy awards (and DL has not yet offered them on it's own metal for long-haul international awards). AF SEA-CDG (AF355) has been operating since March 29th. DL can potentially open award inventory on their own flights for significant schedule changes, but not on partners. 2 hours is the CoC threshold for significant changes.