The bombers create a sense of suspense and also a question of mystery in the novel. It is obvious that the society is involved in some kind of international crisis. However, the people are so concerned with their own happiness and pleasure, that they simply ignore the bombers and wish for 'one more TV wall screen". The presence of the bombers shows how far their pursuit of happiness has gone. They ignore a worldwide crisis which might and does destroy them. After all, to think about a war would make one unhappy.
There are a few different effects that the bombers flying overhead could have on the reader and/or characters of this novel. First, the bombers provide the characters with a constant reminder that the government has total control over them, that their every move is being watched, and that the government will not hesitate to take action. The bombers are present to instill a constant fear in the citizens of Montag's society. A second effect that these bombers could have is on the reader. Throughout Section 1 -- "The Hearth and the Salamander" -- and Section 2 -- "The Sieve and the Sand" the reader has this constant reminder of war planes flying over the city. When he/she gets to the final section -- "Burning Bright" -- it seems that the ending has been foreshadowed for him/her. It is clear that the city will be destroyed by these bombers and will bring the section title to light.