There have been multiples posts on issues with airline refunds. Here is a positive account.
Had purchased tickets on Delta for travel on Air France IAD to CDG. After our RS tour was cancelled waited a bit before contacting Delta. Eventually made the dreaded call to Delta's toll-free number and right away first thing you hear is the standard message of "long waits - up to 6 hours". Decided to take the "call back" option. Sure enough, it took a bit over six hours before the return call.
Once I had an agent on the line they reviewed the itinerary; I indicated that our tour had been cancelled, France was not allowing tourists from abroad, and Air France had no firm date for starting travel out of IAD. The clincher was that I mentioned that we were to have been on a Rick Steves tour. Right away the agent said they were fully aware of RS and associated cancellations. A few click later agent indicated refund had been approved and that was that. Total time from start to end of call - less than five minutes.
And to boot, refund appeared on credit card within 48 hours. Of course now to deal with obtain a refund check from credit card company - always a travail. Will definitely travel again via Delta and partners in the future.
All in all, only item not refunded was travel insurance. Did receive a voucher good till end of 2022 which will apply to future trips. I call this a very positive outcome!