The Jets had already been using Shea as their permanent home, and with the Meadowlands under construction... the Giants came to Shea as well. In 1975, they joined the Mets, Yankees and Jets making for quite a full house. Shea Stadium became the most widely used facility for  Major League level sports in history at this point... and one that groundskeepers and stadium operations simply couldn't keep up with. It was a nightmare maintaining the field and the stadium. By 1976 Shea Stadium had become a mess.