Paladin's Divine Bond special ability has the following text under the first option:
These bonuses can be added to the weapon, stacking with existing weapon bonuses to a maximum of +5, or they can be used to add any of the following weapon properties: axiomatic, brilliant energy, defending, disruption, flaming, flaming burst, holy, keen, merciful, and speed.
The flaming weapon special ability has the following text:
Upon command, a flaming weapon is sheathed in fire that deals an extra 1d6 points of fire damage on a successful hit. The fire does not harm the wielder. The effect remains until another command is given.
Flaming burst weapons also act according to the above text. What additional type of action does the Paladin need to spend to activate the flaming or flaming burst weapon special property, or is it included in the Swift action to activate the ability?