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An airfoil array includes a plurality of airfoils that differ in geometry over a plurality of geometry classes. An airfoil can include an airfoil body that has a first distinct piece and a second distinct piece that seats together with the first distinct piece. The first distinct piece and the secon

An airfoil array includes a plurality of airfoils that differ in geometry over a plurality of geometry classes. An airfoil can include an airfoil body that has a first distinct piece and a second distinct piece that seats together with the first distinct piece. The first distinct piece and the second distinct piece include a mistake-proof feature configured such that the second distinct piece fully seats with the first distinct piece.

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1. An airfoil array comprising: a plurality of airfoils, the airfoils circumferentially-spaced from each other, the airfoils having airfoil portions with aerodynamic contours that differ in geometry from airfoil-to-airfoil according to a plurality of geometry classes such that airfoils in one range

1. An airfoil array comprising: a plurality of airfoils, the airfoils circumferentially-spaced from each other, the airfoils having airfoil portions with aerodynamic contours that differ in geometry from airfoil-to-airfoil according to a plurality of geometry classes such that airfoils in one range of circumferential location are one of the geometry classes and airfoils in another range of circumferential location are of another of the geometry classes, each geometry class defining a different geometry of the aerodynamic contours, each of the airfoil portions including a first distinct piece and a second distinct piece seated with the first distinct piece to form the respective airfoil portion, wherein each first distinct piece and each second distinct piece include a class-dependent mistake-proof feature such that each second distinct piece fully seats together only with each first distinct piece of the same geometry class. 2. The airfoil array as recited in claim 1, wherein the mistake-proof feature includes a notch on one of the first distinct piece or the second distinct piece and a projection on the other of the first distinct piece or the second distinct piece, and the location of the notch and the projection differ according to the plurality of geometry classes. 3. The airfoil array as recited in claim 1, wherein one of the first distinct piece or the second distinct piece is a hollow body and the other is a cover bounding at least a portion of an interior of the hollow body. 4. The airfoil array as recited in claim 3, wherein the interior is hollow. 5. The airfoil array as recited in claim 1, wherein the first distinct piece and the second distinct piece are metallic. 6. The airfoil array as recited in claim 1, wherein the first distinct piece and the second distinct piece include aluminum metal. 7. The airfoil array as recited in claim 1, wherein the first distinct piece and the second distinct piece include a reinforced composite material. 8. The airfoil array as recited in claim 1, wherein the airfoils are hollow. 9. The airfoil array as recited in claim 1, wherein the first distinct pieces are hollow bodies and the second distinct pieces are covers, and the covers have the aerodynamic contours that differ in geometry from airfoil-to-airfoil according to the plurality of geometry classes. 10. The airfoil array as recited in claim 9, wherein each of the hollow bodies and each of the covers include the class-dependent mistake-proof feature. 11. The airfoil array as recited in claim 10, wherein the mistake-proof feature includes a notch and a projection. 12. The airfoil array as recited in claim 10, wherein the hollow bodies and the covers are metallic. 13. The airfoil array as recited in claim 10, wherein the hollow bodies and the covers include aluminum metal. 14. The airfoil array as recited in claim 10, wherein the hollow bodies and the covers include a reinforced composite material. 15. A method for facilitating proper assembly of airfoils in an airfoil array, the method comprising: (a) providing a plurality of first distinct pieces and a plurality of second distinct pieces, wherein the first distinct pieces and the second distinct pieces can be assembled into a circumferentially-spaced airfoil array, the airfoils having airfoil portions with aerodynamic contours that differ in geometry from airfoil-to-airfoil over a plurality of geometry classes, each geometry class defining a different geometry of the aerodynamic contours,wherein each piece includes a class-dependent mistake-proof feature, the class-dependent mistake-proof feature indicating whether ones of the first of the distinct pieces will fully seat together with respective ones of the second distinct pieces;(b) selecting one of the first distinct pieces and one of the second distinct pieces which is adapted for seating together with the selected one of the first distinct pieces according to the class-dependent mistake-proof feature; and(c) seating the selected one of the second distinct pieces against the selected one of the first distinct pieces. 16. The method as recited in claim 15, wherein the mistake-proof feature includes a notch on one of the first distinct piece or the second distinct piece and a projection on the other of the first distinct piece or the second distinct piece, and the location of the notch and the projection differ according to the plurality of geometry classes.