No law saying you have to have it in tanks on Landing.
If you diverted from destination to alternate and experienced delays at your DIV you could easily end up with less than 30 mins fuel on landing. If you were fuel restricted in a long leg.
However it all comes under the big banner of airmanship and sound decision making.
Don't fly the 800 are many of ryr destinations fuel tight with full tanks.
Last edited by sjm; 21st Jan 2013 at 12:37.