Callback: Extra information about layout in the build gui

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Extra information about airport layout in the build gui (155)

This callback allows you to display some extra text in the build airport gui.

Return value Version Meaning
0000..03FF D0xx text to display.
0400 GRFv≥8 Display no text (same as callback failure).
040F Supported by OpenTTD 1515 Not supported by TTDPatch Display text using text ID from register 0x100 (not limited to D0xx texts).

This callback is always called when available, you do not need to set a bit in any action0 property to enable it. Available for OpenTTD since r20272