I honestly don't know if they are going to limit it to just one field or not. At the very least, you should ONLY be able to take off from a LARGE Airfield. If they limit it to one field, it's likely going to be the 163 base. At which point we will probably see just one unique airfield then have all the standard airfields we have now. Otherwise, the Large Fields are gonna need to be revamped with a longer runway. To answer your question, the current airfields cannot support the B-29. They are to short.