It will depend on the capacity in Wh (watt hours) but most commercially available ones should be OK. The IATA guidelines say that under 100Wh (multiply Ah x V to get Wh) is OK to bring on board and in cargo if installed in equipment. If they are loose spare batteries you can bring as many in carry on but not in the hold. Between 100-160Wh same applies but you are restricted to 2 spare loose batteries and again not allowed to check in. If over 160Wh you have to declare it and it has to be packed in cargo under the Dangerous Goods guidelines.Most airlines follow the IATA guidelines.
During extensive travel through Europe, America and Asia I have not seen restrictions that have an issue with power banks below 20000mAh. With this in mind, a ~16000mAh power bank would be a fine option; the ipad air battery capacity is somewhere around 8000mAh so you would have a pack that could effectively triple your devices on-time.
Officially, the IATA guidelines limit you by Watt Hours, which is Amp Hour x Voltage. Their passenger guide shows what these limits are, but you will find that precise limits vary between airlines, such as BA only allowing up to 4 spare batteries per passenger.
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