Beak to Beak

I'd love to know what this little discussion was about between these two mature Tree Swallows. It looked like they took turns "yelling" at each other with beaks wide open and then at times both at the same time as in this shot. Are they a pair having an argument or telling each other how much they care about each other?

 

Taken 18 May 2022 at Potter Marsh, Anchorage, Alaska.

Done