It ain't over til the fat lady sings... But in this case, it may be a phased down closure for SR. I suspect the Swiss government put money in to ensure an orderly shut down. Very embarrassing for the country.

My totally uninformed responses to your questions are:

1)Will AA start codeshares on select CrossAir flights?

This takes bilateral government approval. May likely happen, but government aviation officials are focused on airline security for the moment, these things will come in due couse based on commercial agreements between AA and Crossair.

2)What will happen to the SwissAir name?

It is a registered trade mark and belongs to the company [and its receivers when they are announced]. As such it does have value, or "good will", like most trade marks. It will likely be disposed of with the assets during bankruptcy settlement negotiations. It could be sold -- as the PanAm name has been -- or relinquished, or held on to by whatever entity emerges at the end of the process. The Swiss government may even purchase it for sentimental reasons.

3)When will the all of the SwissAir flights that are being taken over by CrossAir be announced?

Obviously, those involved want to limit customer confusion. Stay tuned, should be soon. However, the likelihood is that Crossair will operate as a domestic carrier, with a few transborder flights to neighbouring countries. It may or may not make a bit for SR's intraEurope routes. This will depend upon the Swiss government and business community. If they view the desirability of having a flag carrier in Europe, then financing will be made available to realize this. If not, the priority will remain linking major Swiss cities with little focus on Europe. Ego and politics, mixed with business realities, will determine this one.

4)Will any of the long-haul flights operated by SwissAir continue under a new Swiss Air or will they be taken over by Cross Air?

Like the above, we must wait to know the answer. Like most global carriers, SR operated several airlines within the mainline carrier: domestic [albeit Crossair handled much of this traffic], transEuropean short and medium haul, and intercontinental longhaul. The real question is which of these made money and which lost money. On the basis of this, we will know what -- if it survives -- a future SR will look like. Or if it does not, to what extent the profitable routes and services will be transferred to Crossair. [Obviously this excludes long-haul intercontinental routes.]

If I were you, I would call AA and rebook on another oneworld carrier, if this is possible. Under the circumstances, I would expect them to make rerouting arrangements without charge for reissuing the tickets. The sooner you do this, the more likely you will get connections that suit your plans, rather than have to take what their computer decides is appropriate.

Hope this idle speculation helps.