Analysing Different Types of Trailers - Avengers: Infinity War

I'm going to analyse marketing materials from Avengers: Infinity War as it has all three types of trailers (teaser, TV spot and theatrical). I'll make a few notes on the most obvious conventions of each.

• montage 
• very quick, 30 seconds
• release date
• name of film

• sometimes older footage used 
• normally haven't yet finished production
• normally around 1 min 30 sec
• voiceover
• slower editing at certain points
• production company logo
• longer sequence for name

• goes though storyline, but doesn't give away too much 
• shows some action 
• longer, normally over 2 mins 
• production company logo
• introduces key characters 
• release date is shown twice
• long name sequence