In spite of continuing to resume "normal" operations, some greedy carriers have simply abandonded answering their telephones.

In the past week, I have needed to contact TWA, AA and DL, while on the road, from my cellphone.

All three have basically the same strategy: "If you want to check a flight, book a ticket, etc. visit our website. For all other calls, all agents are busy. Try back later". Click.

Am I being selfish by wanting to speak with these people? Particularly, when I was stuck at a connecting airport, and the agents were gone?

This seems to be the indication that customer service is simply an option.