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Most airlines allow e-cigarettes to be taken on-board in your carry-on luggage, although it is best to check with the airline before you travel. Some airlines for instance, allow an e-cigarette with a maximum of two spare batteries to be taken on-board. It does not seem to be a problem taking small bottles of e-liquid on planes as it falls under the 100 ml liquid limit. But obviously, you need to put the e-liquid in a clear plastic bag alongside your other liquids. If you have large bottles of e-liquid you should put them in your hold luggage to be safe.
No airlines, as yet allow the use of electronic cigarettes on board the plane, whether this changes remains to be seen!