Generate skyscanner search urls. To open then, copy and paste the result on openlist chrome extension (https://chrome.google.com/webstore/detail/openlist/nkpjembldfckmdchbdiclhfedcngbgnl?hl=en), like you see here: http://i.imgur.com/oCfY2Wy.jpg

skyscanner.php

<?php

// Usage :
// php fly.php <start_date> <trip_interval> <variance> <from> <to>
// 
// Eg: A 7 day trip from VIX to STOC, 30 days of variance
// php fly.php 2015-07-01 30 "+7 day" vix stoc

$start = new \DateTime("{$argv[1]}");
$variance = "+{$argv[2]} day";
$tripInterval = "{$argv[3]}";
$from = "{$argv[4]}";
$to = "{$argv[5]}";

$max = clone $start;
$max->modify($variance);

$template = "http://www.skyscanner.se/transport/flights/%s/%s/%s/%s\n";

while ($start->modify("+1 day")->getTimestamp() <= $max->getTimestamp()) {
	$nextDate = clone $start;
	$nextDate = $nextDate->modify($tripInterval);
	printf($template, $from, $to, $start->format('ymd'), $nextDate->format('ymd'));
}

Where exactly generating skyscanner search urls is going against their terms & conditions? It doesn't do any crawling (scan), and doesn't copy, index or sort anything, since the user is going to see a regular skyscanner page hosted by skyscanner. As far as I understand, I'm creating traffic for skyscanner for free, nothing else.