By Kieren Williams A Boeing plane packed with passengers was forced to turn around after a crack was discovered in the cockpit window. Fliers in Japan were on the domestic journey from the Sapporo-New Chitose Airport to the Toyama Airport but never made it to their destination. Instead, a crack was discovered on the outermost of the four layers of windows that surround the cockpit of the Boeing 737-800. This forced the All Nippon Airways Flight 1182 to turn around and head back to where it had set off from. A spokesperson for the airline told Sky News: “The crack was not something that affecte…