I am scheduled to fly DCA-EWR-TLV in May. UA has suspended service to TLV until May 10. My outbound flight is after May 10 but the suspension could certainly be extended, If that happens, how flexible is UA likely to be in allowing me to switch to different flights? For example, would they switch me to any *A flights I want? Or only certain carriers or fare buckets? (I assume they would not be willing to switch me outside of *A?)

How is this determined? If it matters, I am booked in economy (E+) seating, and my status is Gold.