One key aspect to the modern day ministry of apostles that many writers agree on is that the apostle will be a "mobile" person. That does not necessarily mean that he or she will be 100%itinerant but their ministry will involve a great degree of travelling. Terry Virgo for example is based at Church of Christ the King in Brighton and speaks there often but if one consults his diary - you will see that he is travelling much of his working year. A pastor/teacher on the other hand may make occasional trips abroad but just because there are commitments abroad does not make him an apostle or the trip apostolic!
I wrote much more about the role and ministry of an apostle here.
The reason for this post is that I found what is called "A Personal Word from Ern Baxter" in the New Wine Magazine Archives (March 1978). Ern wrote of his travelling ministry but was speaking more in detail about how he and his wife Ruth felt called to move from Mobile, Alabama where they were based to California where some ministries were asking for his assistance. This move was done with the full support of the other brothers. I found it quite interesting in light of the conversations about apostles and prophets today or not.
Here it is;