Kerala Express is majboori for peoples of Coimbatore and Tiruppur. People of Kerala enjoys many good trains to Delhi like Sampark kranti, Rajdhani, Duronto, Amritsar Exp,Dehradun and so on. Anyways flight from Coimbatore to Delhi is cheaper than train if one who is travelling in AC 2 tier. Cost of Jet Airways is only 3800 and Spicejet is also same and both being non stop. But idiot Jet Airways is now starting to charge for meal. AiR India is better in this case