Here are some links that can help you improve your comprehension skills. These are not related to aviation, but general.
Learn English naturally by listening to speakers from all over the world! You can listen to people talking about the most diverse topics. While listening you can read along and, eventually, get more details on pronunciation and vocabulary.
The passages are real people, speaking real English, talking about what interests them. There are passages for everyone: easy passages for beginners, and more difficult passages for advanced students. You can also choose the domain and topic you want to hear about. If you have any doubt, take a look at the study guide.
This one is fantastic to practice active listening. Different levels, many topics, different media, quizes. All you need for a daily listening practice.
Here you can get new podcasts almost every day, download it from the Internet, and listen to it on your computer or on an MP3/portable music player (for example, an iPod or iRiver). You can subscribe to a podcast so that it is delivered to you automatically each day, just like a newspaper.Topics go from dining to business, from daily life to transportation.
Obs: The podcasts are FREE, the learning guides are not but you can manage without them.
English Podcast about topics in the news. If you want to, the listening comes with a Lesson Plan and worksheets so that you can memorize better new vocabulary.