When writing we all need to be careful of our spelling and grammar, using a dictionary or spell checker might not be enough. Common spelling mistakes happen so frequently that there is now a top 5 list of the most common misspelled words. “loosing” / “todays” / “everytime” / “aircrafts” / “ect”
The reasons why these words are misspelled and the rules to follow about them can be found at http://blog.ezinearticles.com/2011/12/top-spelling-blunders.html. Remember to always double check your writing for not only grammatical mistakes but also common spelling errors.