I have a flight booked for 1/17 - 1/18 , a land and return with rescue dogs. I've done it 3 times since October, the first 2 flights I did a Covid test before I left and the 72 hour testing rule was in effect, to return to USA. However, last flight I had no option but to be tested in t4 as I had 6 hours between flights and the new 24 hour test rule was in effect. It was easy and I had a reservation. However, since I booked this upcoming flight and as of today, I cannot make an appt on the calendar for a covid test in t4 - they are not showing any dates open after Dec 31. Any info or insight on this? Thanks.