'divert' could mean what gillnetter has said, or 'send to another destination/airport instead of to the original one'. eg: 'the flight was diverted to Glasgow because thick fog at Heathrow prevented a landing there.'
'Interrupt' is an odd word here. Stopping the take-off has already been covered by the earlier mention of delay. Your own interpretation is probably the best and it could include the aircraft returning to its departure airport.
This must be an extract from the 'Terms and Conditions' of a flight operator (airline) or an aviation authority. Phrased in a typical legal style, it is designed to prevent an irate passenger demanding compensation when something goes wrong. The writer is trying to cover all possibilities, and I'd say he's succeeded!
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