Neither EASA (formally JAR) compliant States, nor North America allow planning without an Alternate except for very restrictive rules in the case of a remote destination.
JAR allowed no alternate for flights less than 6 hours where there are 2 seperate runways and the weather was forecast to be 2000/5km. It was in the EASA version of my former employer's part A 6 months ago so I guess they are carrying on with it.