Quick tips: When you're flying in carry a pen. Both customs and immigration forms are required but your airline may not provide you with both. When you're flying out (especially international) make sure to arrive as early as possible during peak season. If you're flying outside of the main tourist season you'll be okay if you arrive within the time recommended by your airline otherwise make sure to give yourself an extra hour or so. Be as courteous as possible do not act entitled and be careful when questioning the authority of airport officials. This is generally a good guideline for flying anywhere in India. People working at the airport will be happy to return the gesture if you go out of your way to show them some kindness. Arriving in India for the first time can be pretty stressful but I've seen the process become downright awful countless times as other westerners get held up because they acted contentiously at a checkpoint. If it takes you 90 minutes to get into Kochi you need a new driver. Granted Kochi is big but without traffic it takes only 20-30 minutes to get to Lulu Mall which is in Edappally.