Any information you can provide on the matter below will be much appreciated.

While transiting through Los Angeles airport, one has to:

1. clear immigration
2. pick up baggage
3. clear customs
4. re-check in baggage
5. go outside the airport building
6. catch a shuttle bus to another terminal
7. check in for final leg of the flight

Is it the same process while transiting through Washington Dulles airport?

If I am to fly to Chicago via Washington (with latter being port of entry), can the good folks at Kathmandu airport check my luggage all the way to Chicago and provide the boarding pass for complete voyage? Or, do I have claim my bags, re-check them in, take a bus to another terminal, check myself in for the final flight to my destination?

What exactly is the transit process at Washington Dulles airport?

How about for New York's JFK airport?

Thanks in advance for help.

No one has transited through Washington Dulles airport? Or just don't want to share information?

As far as I know, you have to follow the same steps at any port of entry if US is your final destination.

1. clear immigration
2. claim baggage
3. clear customs
4. re-checkin baggage (this depends - sometimes the officials will simply put it back on the belt for recheckin, and at other times you have to lug the baggage to the respective airline for rechecking in)
5. proceed to the correct terminal for the next leg of your voyage.

All these are done at single entry point aka port of entry. After that your flights are considered domestic.

Hope it helps