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We review how the Regge trajectory of an elastic resonance can be obtainedjust from its pole position and coupling, using a dispersive formalism. Thisallows us to deal correctly with the finite widths of resonances in Reggetrajectories. In this way we can calculate the Regge trajectories for the$K^*(892)$, $K_1(1400)$ and $K^*_0(1430)$, obtaining ordinary linear Reggetrajectories, expected for $q \bar q$ resonances. In contrast, for the$K^*_0(800)$ meson, the resulting Regge trajectory is non-linear and with muchsmaller slope, strongly supporting its non-ordinary nature.

Calculation of Regge trajectories of strange resonances and identification of the K0*(800) as a non-ordinary meson