VATICAN CITY — If any evidence were needed to underscore that Pope Francis' upcoming trip to Asia and Oceania is the longest, farthest and most challenging of his pontificate, it's that he's bringing along his secretaries to help him navigate the four-country program while keeping up with work back home.

Francis will clock 32,814 kilometers (20,390 miles) by air during his Sept. 2-13 visit to Indonesia, Papua New Guinea, East Timor and Singapore, far surpassing any of his previous 44 foreign trips and notching one of the longest papal trips ever, both in terms of days on the road and distances traveled.